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 #include <linux/lockdep.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-sta.h"
  38
  39 /* priv->sta_lock must be held */
  40 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  41 {
  42
  43         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  44                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  45                         sta_id, priv->stations[sta_id].sta.sta.addr);
  46
  47         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  48                 IWL_DEBUG_ASSOC(priv,
  49                                 "STA id %u addr %pM already present in uCode (according to driver)\n",
  50                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  51         } else {
  52                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  53                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  54                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  55         }
  56 }
  57
  58 static int iwl_process_add_sta_resp(struct iwl_priv *priv,
  59                                     struct iwl_addsta_cmd *addsta,
  60                                     struct iwl_rx_packet *pkt,
  61                                     bool sync)
  62 {
  63         u8 sta_id = addsta->sta.sta_id;
  64         unsigned long flags;
  65         int ret = -EIO;
  66
  67         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  68                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  69                         pkt->hdr.flags);
  70                 return ret;
  71         }
  72
  73         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  74                        sta_id);
  75
  76         spin_lock_irqsave(&priv->sta_lock, flags);
  77
  78         switch (pkt->u.add_sta.status) {
  79         case ADD_STA_SUCCESS_MSK:
  80                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  81                 iwl_sta_ucode_activate(priv, sta_id);
  82                 ret = 0;
  83                 break;
  84         case ADD_STA_NO_ROOM_IN_TABLE:
  85                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  86                         sta_id);
  87                 break;
  88         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  89                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  90                         sta_id);
  91                 break;
  92         case ADD_STA_MODIFY_NON_EXIST_STA:
  93                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  94                         sta_id);
  95                 break;
  96         default:
  97                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  98                                 pkt->u.add_sta.status);
  99                 break;
 100         }
 101
 102         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 103                        priv->stations[sta_id].sta.mode ==
 104                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 105                        sta_id, priv->stations[sta_id].sta.sta.addr);
 106
 107         /*
 108          * XXX: The MAC address in the command buffer is often changed from
 109          * the original sent to the device. That is, the MAC address
 110          * written to the command buffer often is not the same MAC adress
 111          * read from the command buffer when the command returns. This
 112          * issue has not yet been resolved and this debugging is left to
 113          * observe the problem.
 114          */
 115         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 116                        priv->stations[sta_id].sta.mode ==
 117                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 118                        addsta->sta.addr);
 119         spin_unlock_irqrestore(&priv->sta_lock, flags);
 120
 121         return ret;
 122 }
 123
 124 static void iwl_add_sta_callback(struct iwl_priv *priv,
 125                                  struct iwl_device_cmd *cmd,
 126                                  struct iwl_rx_packet *pkt)
 127 {
 128         struct iwl_addsta_cmd *addsta =
 129                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 130
 131         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 132
 133 }
 134
 135 int iwl_send_add_sta(struct iwl_priv *priv,
 136                      struct iwl_addsta_cmd *sta, u8 flags)
 137 {
 138         struct iwl_rx_packet *pkt = NULL;
 139         int ret = 0;
 140         u8 data[sizeof(*sta)];
 141         struct iwl_host_cmd cmd = {
 142                 .id = REPLY_ADD_STA,
 143                 .flags = flags,
 144                 .data = data,
 145         };
 146         u8 sta_id __maybe_unused = sta->sta.sta_id;
 147
 148         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 149                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 150
 151         if (flags & CMD_ASYNC)
 152                 cmd.callback = iwl_add_sta_callback;
 153         else {
 154                 cmd.flags |= CMD_WANT_SKB;
 155                 might_sleep();
 156         }
 157
 158         cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 159         ret = iwl_send_cmd(priv, &cmd);
 160
 161         if (ret || (flags & CMD_ASYNC))
 162                 return ret;
 163
 164         if (ret == 0) {
 165                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 166                 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
 167         }
 168         iwl_free_pages(priv, cmd.reply_page);
 169
 170         return ret;
 171 }
 172 EXPORT_SYMBOL(iwl_send_add_sta);
 173
 174 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 175                                    struct ieee80211_sta_ht_cap *sta_ht_inf)
 176 {
 177         __le32 sta_flags;
 178         u8 mimo_ps_mode;
 179
 180         if (!sta_ht_inf || !sta_ht_inf->ht_supported)
 181                 goto done;
 182
 183         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 184         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 185                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 186                         "static" :
 187                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 188                         "dynamic" : "disabled");
 189
 190         sta_flags = priv->stations[index].sta.station_flags;
 191
 192         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 193
 194         switch (mimo_ps_mode) {
 195         case WLAN_HT_CAP_SM_PS_STATIC:
 196                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 197                 break;
 198         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 199                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 200                 break;
 201         case WLAN_HT_CAP_SM_PS_DISABLED:
 202                 break;
 203         default:
 204                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 205                 break;
 206         }
 207
 208         sta_flags |= cpu_to_le32(
 209               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 210
 211         sta_flags |= cpu_to_le32(
 212               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 213
 214         if (iwl_is_ht40_tx_allowed(priv, sta_ht_inf))
 215                 sta_flags |= STA_FLG_HT40_EN_MSK;
 216         else
 217                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 218
 219         priv->stations[index].sta.station_flags = sta_flags;
 220  done:
 221         return;
 222 }
 223
 224 /**
 225  * iwl_prep_station - Prepare station information for addition
 226  *
 227  * should be called with sta_lock held
 228  */
 229 static u8 iwl_prep_station(struct iwl_priv *priv, const u8 *addr,
 230                            bool is_ap,
 231                            struct ieee80211_sta_ht_cap *ht_info)
 232 {
 233         struct iwl_station_entry *station;
 234         int i;
 235         u8 sta_id = IWL_INVALID_STATION;
 236         u16 rate;
 237
 238         if (is_ap)
 239                 sta_id = IWL_AP_ID;
 240         else if (is_broadcast_ether_addr(addr))
 241                 sta_id = priv->hw_params.bcast_sta_id;
 242         else
 243                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 244                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 245                                                 addr)) {
 246                                 sta_id = i;
 247                                 break;
 248                         }
 249
 250                         if (!priv->stations[i].used &&
 251                             sta_id == IWL_INVALID_STATION)
 252                                 sta_id = i;
 253                 }
 254
 255         /*
 256          * These two conditions have the same outcome, but keep them
 257          * separate
 258          */
 259         if (unlikely(sta_id == IWL_INVALID_STATION))
 260                 return sta_id;
 261
 262         /*
 263          * uCode is not able to deal with multiple requests to add a
 264          * station. Keep track if one is in progress so that we do not send
 265          * another.
 266          */
 267         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 268                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 269                                 sta_id);
 270                 return sta_id;
 271         }
 272
 273         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 274             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 275             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 276                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 277                                 sta_id, addr);
 278                 return sta_id;
 279         }
 280
 281         station = &priv->stations[sta_id];
 282         station->used = IWL_STA_DRIVER_ACTIVE;
 283         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 284                         sta_id, addr);
 285         priv->num_stations++;
 286
 287         /* Set up the REPLY_ADD_STA command to send to device */
 288         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 289         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 290         station->sta.mode = 0;
 291         station->sta.sta.sta_id = sta_id;
 292         station->sta.station_flags = 0;
 293
 294         /*
 295          * OK to call unconditionally, since local stations (IBSS BSSID
 296          * STA and broadcast STA) pass in a NULL ht_info, and mac80211
 297          * doesn't allow HT IBSS.
 298          */
 299         iwl_set_ht_add_station(priv, sta_id, ht_info);
 300
 301         /* 3945 only */
 302         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 303                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 304         /* Turn on both antennas for the station... */
 305         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 306
 307         return sta_id;
 308
 309 }
 310
 311 #define STA_WAIT_TIMEOUT (HZ/2)
 312
 313 /**
 314  * iwl_add_station_common -
 315  */
 316 int iwl_add_station_common(struct iwl_priv *priv, const u8 *addr,
 317                                   bool is_ap,
 318                                   struct ieee80211_sta_ht_cap *ht_info,
 319                                   u8 *sta_id_r)
 320 {
 321         unsigned long flags_spin;
 322         int ret = 0;
 323         u8 sta_id;
 324         struct iwl_addsta_cmd sta_cmd;
 325
 326         *sta_id_r = 0;
 327         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 328         sta_id = iwl_prep_station(priv, addr, is_ap, ht_info);
 329         if (sta_id == IWL_INVALID_STATION) {
 330                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 331                         addr);
 332                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 333                 return -EINVAL;
 334         }
 335
 336         /*
 337          * uCode is not able to deal with multiple requests to add a
 338          * station. Keep track if one is in progress so that we do not send
 339          * another.
 340          */
 341         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 342                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 343                                sta_id);
 344                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 345                 return -EEXIST;
 346         }
 347
 348         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 349             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 350                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 351                                 sta_id, addr);
 352                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 353                 return -EEXIST;
 354         }
 355
 356         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 357         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 358         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 359
 360         /* Add station to device's station table */
 361         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 362         if (ret) {
 363                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 364                 IWL_ERR(priv, "Adding station %pM failed.\n",
 365                         priv->stations[sta_id].sta.sta.addr);
 366                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 367                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 368                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 369         }
 370         *sta_id_r = sta_id;
 371         return ret;
 372 }
 373 EXPORT_SYMBOL(iwl_add_station_common);
 374
 375 static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 376                                                      u8 sta_id)
 377 {
 378         int i, r;
 379         struct iwl_link_quality_cmd *link_cmd;
 380         u32 rate_flags;
 381
 382         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 383         if (!link_cmd) {
 384                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 385                 return NULL;
 386         }
 387         /* Set up the rate scaling to start at selected rate, fall back
 388          * all the way down to 1M in IEEE order, and then spin on 1M */
 389         if (priv->band == IEEE80211_BAND_5GHZ)
 390                 r = IWL_RATE_6M_INDEX;
 391         else
 392                 r = IWL_RATE_1M_INDEX;
 393
 394         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 395                 rate_flags = 0;
 396                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 397                         rate_flags |= RATE_MCS_CCK_MSK;
 398
 399                 rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
 400                                 RATE_MCS_ANT_POS;
 401
 402                 link_cmd->rs_table[i].rate_n_flags =
 403                         iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 404                 r = iwl_get_prev_ieee_rate(r);
 405         }
 406
 407         link_cmd->general_params.single_stream_ant_msk =
 408                                 first_antenna(priv->hw_params.valid_tx_ant);
 409
 410         link_cmd->general_params.dual_stream_ant_msk =
 411                 priv->hw_params.valid_tx_ant &
 412                 ~first_antenna(priv->hw_params.valid_tx_ant);
 413         if (!link_cmd->general_params.dual_stream_ant_msk) {
 414                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 415         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
 416                 link_cmd->general_params.dual_stream_ant_msk =
 417                         priv->hw_params.valid_tx_ant;
 418         }
 419
 420         link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 421         link_cmd->agg_params.agg_time_limit =
 422                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 423
 424         link_cmd->sta_id = sta_id;
 425
 426         return link_cmd;
 427 }
 428
 429 /*
 430  * iwl_add_bssid_station - Add the special IBSS BSSID station
 431  *
 432  * Function sleeps.
 433  */
 434 int iwl_add_bssid_station(struct iwl_priv *priv, const u8 *addr, bool init_rs,
 435                           u8 *sta_id_r)
 436 {
 437         int ret;
 438         u8 sta_id;
 439         struct iwl_link_quality_cmd *link_cmd;
 440         unsigned long flags;
 441
 442         if (sta_id_r)
 443                 *sta_id_r = IWL_INVALID_STATION;
 444
 445         ret = iwl_add_station_common(priv, addr, 0, NULL, &sta_id);
 446         if (ret) {
 447                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 448                 return ret;
 449         }
 450
 451         if (sta_id_r)
 452                 *sta_id_r = sta_id;
 453
 454         spin_lock_irqsave(&priv->sta_lock, flags);
 455         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 456         spin_unlock_irqrestore(&priv->sta_lock, flags);
 457
 458         if (init_rs) {
 459                 /* Set up default rate scaling table in device's station table */
 460                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
 461                 if (!link_cmd) {
 462                         IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
 463                                 addr);
 464                         return -ENOMEM;
 465                 }
 466
 467                 ret = iwl_send_lq_cmd(priv, link_cmd, CMD_SYNC, true);
 468                 if (ret)
 469                         IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 470
 471                 spin_lock_irqsave(&priv->sta_lock, flags);
 472                 priv->stations[sta_id].lq = link_cmd;
 473                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 474         }
 475
 476         return 0;
 477 }
 478 EXPORT_SYMBOL(iwl_add_bssid_station);
 479
 480 /**
 481  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 482  *
 483  * priv->sta_lock must be held
 484  */
 485 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 486 {
 487         /* Ucode must be active and driver must be non active */
 488         if ((priv->stations[sta_id].used &
 489              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 490                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 491
 492         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 493
 494         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 495         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 496 }
 497
 498 static int iwl_send_remove_station(struct iwl_priv *priv,
 499                                    const u8 *addr, int sta_id)
 500 {
 501         struct iwl_rx_packet *pkt;
 502         int ret;
 503
 504         unsigned long flags_spin;
 505         struct iwl_rem_sta_cmd rm_sta_cmd;
 506
 507         struct iwl_host_cmd cmd = {
 508                 .id = REPLY_REMOVE_STA,
 509                 .len = sizeof(struct iwl_rem_sta_cmd),
 510                 .flags = CMD_SYNC,
 511                 .data = &rm_sta_cmd,
 512         };
 513
 514         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 515         rm_sta_cmd.num_sta = 1;
 516         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 517
 518         cmd.flags |= CMD_WANT_SKB;
 519
 520         ret = iwl_send_cmd(priv, &cmd);
 521
 522         if (ret)
 523                 return ret;
 524
 525         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 526         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 527                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 528                           pkt->hdr.flags);
 529                 ret = -EIO;
 530         }
 531
 532         if (!ret) {
 533                 switch (pkt->u.rem_sta.status) {
 534                 case REM_STA_SUCCESS_MSK:
 535                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 536                         iwl_sta_ucode_deactivate(priv, sta_id);
 537                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 538                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 539                         break;
 540                 default:
 541                         ret = -EIO;
 542                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 543                         break;
 544                 }
 545         }
 546         iwl_free_pages(priv, cmd.reply_page);
 547
 548         return ret;
 549 }
 550
 551 /**
 552  * iwl_remove_station - Remove driver's knowledge of station.
 553  */
 554 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 555                        const u8 *addr)
 556 {
 557         unsigned long flags;
 558
 559         if (!iwl_is_ready(priv)) {
 560                 IWL_DEBUG_INFO(priv,
 561                         "Unable to remove station %pM, device not ready.\n",
 562                         addr);
 563                 /*
 564                  * It is typical for stations to be removed when we are
 565                  * going down. Return success since device will be down
 566                  * soon anyway
 567                  */
 568                 return 0;
 569         }
 570
 571         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 572                         sta_id, addr);
 573
 574         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 575                 return -EINVAL;
 576
 577         spin_lock_irqsave(&priv->sta_lock, flags);
 578
 579         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 580                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 581                                 addr);
 582                 goto out_err;
 583         }
 584
 585         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 586                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 587                                 addr);
 588                 goto out_err;
 589         }
 590
 591         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 592                 kfree(priv->stations[sta_id].lq);
 593                 priv->stations[sta_id].lq = NULL;
 594         }
 595
 596         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 597
 598         priv->num_stations--;
 599
 600         BUG_ON(priv->num_stations < 0);
 601
 602         spin_unlock_irqrestore(&priv->sta_lock, flags);
 603
 604         return iwl_send_remove_station(priv, addr, sta_id);
 605 out_err:
 606         spin_unlock_irqrestore(&priv->sta_lock, flags);
 607         return -EINVAL;
 608 }
 609 EXPORT_SYMBOL_GPL(iwl_remove_station);
 610
 611 /**
 612  * iwl_clear_ucode_stations - clear ucode station table bits
 613  *
 614  * This function clears all the bits in the driver indicating
 615  * which stations are active in the ucode. Call when something
 616  * other than explicit station management would cause this in
 617  * the ucode, e.g. unassociated RXON.
 618  */
 619 void iwl_clear_ucode_stations(struct iwl_priv *priv)
 620 {
 621         int i;
 622         unsigned long flags_spin;
 623         bool cleared = false;
 624
 625         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 626
 627         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 628         for (i = 0; i < priv->hw_params.max_stations; i++) {
 629                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 630                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 631                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 632                         cleared = true;
 633                 }
 634         }
 635         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 636
 637         if (!cleared)
 638                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 639 }
 640 EXPORT_SYMBOL(iwl_clear_ucode_stations);
 641
 642 /**
 643  * iwl_restore_stations() - Restore driver known stations to device
 644  *
 645  * All stations considered active by driver, but not present in ucode, is
 646  * restored.
 647  *
 648  * Function sleeps.
 649  */
 650 void iwl_restore_stations(struct iwl_priv *priv)
 651 {
 652         struct iwl_addsta_cmd sta_cmd;
 653         struct iwl_link_quality_cmd lq;
 654         unsigned long flags_spin;
 655         int i;
 656         bool found = false;
 657         int ret;
 658         bool send_lq;
 659
 660         if (!iwl_is_ready(priv)) {
 661                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 662                 return;
 663         }
 664
 665         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 666         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 667         for (i = 0; i < priv->hw_params.max_stations; i++) {
 668                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 669                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 670                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 671                                         priv->stations[i].sta.sta.addr);
 672                         priv->stations[i].sta.mode = 0;
 673                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 674                         found = true;
 675                 }
 676         }
 677
 678         for (i = 0; i < priv->hw_params.max_stations; i++) {
 679                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 680                         memcpy(&sta_cmd, &priv->stations[i].sta,
 681                                sizeof(struct iwl_addsta_cmd));
 682                         send_lq = false;
 683                         if (priv->stations[i].lq) {
 684                                 memcpy(&lq, priv->stations[i].lq,
 685                                        sizeof(struct iwl_link_quality_cmd));
 686                                 send_lq = true;
 687                         }
 688                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 689                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 690                         if (ret) {
 691                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 692                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 693                                         priv->stations[i].sta.sta.addr);
 694                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 695                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 696                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 697                         }
 698                         /*
 699                          * Rate scaling has already been initialized, send
 700                          * current LQ command
 701                          */
 702                         if (send_lq)
 703                                 iwl_send_lq_cmd(priv, &lq, CMD_SYNC, true);
 704                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 705                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 706                 }
 707         }
 708
 709         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 710         if (!found)
 711                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 712         else
 713                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 714 }
 715 EXPORT_SYMBOL(iwl_restore_stations);
 716
 717 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 718 {
 719         int i;
 720
 721         for (i = 0; i < STA_KEY_MAX_NUM; i++)
 722                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 723                         return i;
 724
 725         return WEP_INVALID_OFFSET;
 726 }
 727 EXPORT_SYMBOL(iwl_get_free_ucode_key_index);
 728
 729 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
 730 {
 731         int i, not_empty = 0;
 732         u8 buff[sizeof(struct iwl_wep_cmd) +
 733                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 734         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 735         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 736         struct iwl_host_cmd cmd = {
 737                 .id = REPLY_WEPKEY,
 738                 .data = wep_cmd,
 739                 .flags = CMD_SYNC,
 740         };
 741
 742         might_sleep();
 743
 744         memset(wep_cmd, 0, cmd_size +
 745                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 746
 747         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 748                 wep_cmd->key[i].key_index = i;
 749                 if (priv->wep_keys[i].key_size) {
 750                         wep_cmd->key[i].key_offset = i;
 751                         not_empty = 1;
 752                 } else {
 753                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 754                 }
 755
 756                 wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
 757                 memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
 758                                 priv->wep_keys[i].key_size);
 759         }
 760
 761         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 762         wep_cmd->num_keys = WEP_KEYS_MAX;
 763
 764         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 765
 766         cmd.len = cmd_size;
 767
 768         if (not_empty || send_if_empty)
 769                 return iwl_send_cmd(priv, &cmd);
 770         else
 771                 return 0;
 772 }
 773
 774 int iwl_restore_default_wep_keys(struct iwl_priv *priv)
 775 {
 776         lockdep_assert_held(&priv->mutex);
 777
 778         return iwl_send_static_wepkey_cmd(priv, 0);
 779 }
 780 EXPORT_SYMBOL(iwl_restore_default_wep_keys);
 781
 782 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 783                                struct ieee80211_key_conf *keyconf)
 784 {
 785         int ret;
 786
 787         lockdep_assert_held(&priv->mutex);
 788
 789         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
 790                       keyconf->keyidx);
 791
 792         memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
 793         if (iwl_is_rfkill(priv)) {
 794                 IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
 795                 /* but keys in device are clear anyway so return success */
 796                 return 0;
 797         }
 798         ret = iwl_send_static_wepkey_cmd(priv, 1);
 799         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
 800                       keyconf->keyidx, ret);
 801
 802         return ret;
 803 }
 804 EXPORT_SYMBOL(iwl_remove_default_wep_key);
 805
 806 int iwl_set_default_wep_key(struct iwl_priv *priv,
 807                             struct ieee80211_key_conf *keyconf)
 808 {
 809         int ret;
 810
 811         lockdep_assert_held(&priv->mutex);
 812
 813         if (keyconf->keylen != WEP_KEY_LEN_128 &&
 814             keyconf->keylen != WEP_KEY_LEN_64) {
 815                 IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
 816                 return -EINVAL;
 817         }
 818
 819         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 820         keyconf->hw_key_idx = HW_KEY_DEFAULT;
 821         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 822
 823         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 824         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
 825                                                         keyconf->keylen);
 826
 827         ret = iwl_send_static_wepkey_cmd(priv, 0);
 828         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
 829                 keyconf->keylen, keyconf->keyidx, ret);
 830
 831         return ret;
 832 }
 833 EXPORT_SYMBOL(iwl_set_default_wep_key);
 834
 835 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 836                                 struct ieee80211_key_conf *keyconf,
 837                                 u8 sta_id)
 838 {
 839         unsigned long flags;
 840         __le16 key_flags = 0;
 841         struct iwl_addsta_cmd sta_cmd;
 842
 843         lockdep_assert_held(&priv->mutex);
 844
 845         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 846
 847         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 848         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 849         key_flags &= ~STA_KEY_FLG_INVALID;
 850
 851         if (keyconf->keylen == WEP_KEY_LEN_128)
 852                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 853
 854         if (sta_id == priv->hw_params.bcast_sta_id)
 855                 key_flags |= STA_KEY_MULTICAST_MSK;
 856
 857         spin_lock_irqsave(&priv->sta_lock, flags);
 858
 859         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 860         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 861         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 862
 863         memcpy(priv->stations[sta_id].keyinfo.key,
 864                                 keyconf->key, keyconf->keylen);
 865
 866         memcpy(&priv->stations[sta_id].sta.key.key[3],
 867                                 keyconf->key, keyconf->keylen);
 868
 869         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 870                         == STA_KEY_FLG_NO_ENC)
 871                 priv->stations[sta_id].sta.key.key_offset =
 872                                  iwl_get_free_ucode_key_index(priv);
 873         /* else, we are overriding an existing key => no need to allocated room
 874          * in uCode. */
 875
 876         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 877                 "no space for a new key");
 878
 879         priv->stations[sta_id].sta.key.key_flags = key_flags;
 880         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 881         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 882
 883         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 884         spin_unlock_irqrestore(&priv->sta_lock, flags);
 885
 886         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 887 }
 888
 889 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 890                                    struct ieee80211_key_conf *keyconf,
 891                                    u8 sta_id)
 892 {
 893         unsigned long flags;
 894         __le16 key_flags = 0;
 895         struct iwl_addsta_cmd sta_cmd;
 896
 897         lockdep_assert_held(&priv->mutex);
 898
 899         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 900         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 901         key_flags &= ~STA_KEY_FLG_INVALID;
 902
 903         if (sta_id == priv->hw_params.bcast_sta_id)
 904                 key_flags |= STA_KEY_MULTICAST_MSK;
 905
 906         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 907
 908         spin_lock_irqsave(&priv->sta_lock, flags);
 909         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 910         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 911
 912         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 913                keyconf->keylen);
 914
 915         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 916                keyconf->keylen);
 917
 918         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 919                         == STA_KEY_FLG_NO_ENC)
 920                 priv->stations[sta_id].sta.key.key_offset =
 921                                  iwl_get_free_ucode_key_index(priv);
 922         /* else, we are overriding an existing key => no need to allocated room
 923          * in uCode. */
 924
 925         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 926                 "no space for a new key");
 927
 928         priv->stations[sta_id].sta.key.key_flags = key_flags;
 929         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 930         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 931
 932         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 933         spin_unlock_irqrestore(&priv->sta_lock, flags);
 934
 935         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 936 }
 937
 938 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 939                                    struct ieee80211_key_conf *keyconf,
 940                                    u8 sta_id)
 941 {
 942         unsigned long flags;
 943         int ret = 0;
 944         __le16 key_flags = 0;
 945
 946         key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
 947         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 948         key_flags &= ~STA_KEY_FLG_INVALID;
 949
 950         if (sta_id == priv->hw_params.bcast_sta_id)
 951                 key_flags |= STA_KEY_MULTICAST_MSK;
 952
 953         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 954         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 955
 956         spin_lock_irqsave(&priv->sta_lock, flags);
 957
 958         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 959         priv->stations[sta_id].keyinfo.keylen = 16;
 960
 961         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 962                         == STA_KEY_FLG_NO_ENC)
 963                 priv->stations[sta_id].sta.key.key_offset =
 964                                  iwl_get_free_ucode_key_index(priv);
 965         /* else, we are overriding an existing key => no need to allocated room
 966          * in uCode. */
 967
 968         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 969                 "no space for a new key");
 970
 971         priv->stations[sta_id].sta.key.key_flags = key_flags;
 972
 973
 974         /* This copy is acutally not needed: we get the key with each TX */
 975         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 976
 977         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 978
 979         spin_unlock_irqrestore(&priv->sta_lock, flags);
 980
 981         return ret;
 982 }
 983
 984 void iwl_update_tkip_key(struct iwl_priv *priv,
 985                         struct ieee80211_key_conf *keyconf,
 986                         struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
 987 {
 988         u8 sta_id;
 989         unsigned long flags;
 990         int i;
 991
 992         if (iwl_scan_cancel(priv)) {
 993                 /* cancel scan failed, just live w/ bad key and rely
 994                    briefly on SW decryption */
 995                 return;
 996         }
 997
 998         sta_id = iwl_sta_id_or_broadcast(priv, sta);
 999         if (sta_id == IWL_INVALID_STATION)
1000                 return;
1001
1002         spin_lock_irqsave(&priv->sta_lock, flags);
1003
1004         priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;
1005
1006         for (i = 0; i < 5; i++)
1007                 priv->stations[sta_id].sta.key.tkip_rx_ttak[i] =
1008                         cpu_to_le16(phase1key[i]);
1009
1010         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1011         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1012
1013         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1014
1015         spin_unlock_irqrestore(&priv->sta_lock, flags);
1016
1017 }
1018 EXPORT_SYMBOL(iwl_update_tkip_key);
1019
1020 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1021                                 struct ieee80211_key_conf *keyconf,
1022                                 u8 sta_id)
1023 {
1024         unsigned long flags;
1025         u16 key_flags;
1026         u8 keyidx;
1027         struct iwl_addsta_cmd sta_cmd;
1028
1029         lockdep_assert_held(&priv->mutex);
1030
1031         priv->key_mapping_key--;
1032
1033         spin_lock_irqsave(&priv->sta_lock, flags);
1034         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
1035         keyidx = (key_flags >> STA_KEY_FLG_KEYID_POS) & 0x3;
1036
1037         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1038                       keyconf->keyidx, sta_id);
1039
1040         if (keyconf->keyidx != keyidx) {
1041                 /* We need to remove a key with index different that the one
1042                  * in the uCode. This means that the key we need to remove has
1043                  * been replaced by another one with different index.
1044                  * Don't do anything and return ok
1045                  */
1046                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1047                 return 0;
1048         }
1049
1050         if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
1051                 IWL_WARN(priv, "Removing wrong key %d 0x%x\n",
1052                             keyconf->keyidx, key_flags);
1053                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1054                 return 0;
1055         }
1056
1057         if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
1058                 &priv->ucode_key_table))
1059                 IWL_ERR(priv, "index %d not used in uCode key table.\n",
1060                         priv->stations[sta_id].sta.key.key_offset);
1061         memset(&priv->stations[sta_id].keyinfo, 0,
1062                                         sizeof(struct iwl_hw_key));
1063         memset(&priv->stations[sta_id].sta.key, 0,
1064                                         sizeof(struct iwl4965_keyinfo));
1065         priv->stations[sta_id].sta.key.key_flags =
1066                         STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
1067         priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
1068         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1069         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1070
1071         if (iwl_is_rfkill(priv)) {
1072                 IWL_DEBUG_WEP(priv, "Not sending REPLY_ADD_STA command because RFKILL enabled.\n");
1073                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1074                 return 0;
1075         }
1076         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1077         spin_unlock_irqrestore(&priv->sta_lock, flags);
1078
1079         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1080 }
1081 EXPORT_SYMBOL(iwl_remove_dynamic_key);
1082
1083 int iwl_set_dynamic_key(struct iwl_priv *priv,
1084                                 struct ieee80211_key_conf *keyconf, u8 sta_id)
1085 {
1086         int ret;
1087
1088         lockdep_assert_held(&priv->mutex);
1089
1090         priv->key_mapping_key++;
1091         keyconf->hw_key_idx = HW_KEY_DYNAMIC;
1092
1093         switch (keyconf->alg) {
1094         case ALG_CCMP:
1095                 ret = iwl_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
1096                 break;
1097         case ALG_TKIP:
1098                 ret = iwl_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
1099                 break;
1100         case ALG_WEP:
1101                 ret = iwl_set_wep_dynamic_key_info(priv, keyconf, sta_id);
1102                 break;
1103         default:
1104                 IWL_ERR(priv,
1105                         "Unknown alg: %s alg = %d\n", __func__, keyconf->alg);
1106                 ret = -EINVAL;
1107         }
1108
1109         IWL_DEBUG_WEP(priv, "Set dynamic key: alg= %d len=%d idx=%d sta=%d ret=%d\n",
1110                       keyconf->alg, keyconf->keylen, keyconf->keyidx,
1111                       sta_id, ret);
1112
1113         return ret;
1114 }
1115 EXPORT_SYMBOL(iwl_set_dynamic_key);
1116
1117 #ifdef CONFIG_IWLWIFI_DEBUG
1118 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
1119                            struct iwl_link_quality_cmd *lq)
1120 {
1121         int i;
1122         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
1123         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
1124                        lq->general_params.single_stream_ant_msk,
1125                        lq->general_params.dual_stream_ant_msk);
1126
1127         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
1128                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
1129                                i, lq->rs_table[i].rate_n_flags);
1130 }
1131 #else
1132 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
1133                                    struct iwl_link_quality_cmd *lq)
1134 {
1135 }
1136 #endif
1137
1138 /**
1139  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
1140  *
1141  * It sometimes happens when a HT rate has been in use and we
1142  * loose connectivity with AP then mac80211 will first tell us that the
1143  * current channel is not HT anymore before removing the station. In such a
1144  * scenario the RXON flags will be updated to indicate we are not
1145  * communicating HT anymore, but the LQ command may still contain HT rates.
1146  * Test for this to prevent driver from sending LQ command between the time
1147  * RXON flags are updated and when LQ command is updated.
1148  */
1149 static bool is_lq_table_valid(struct iwl_priv *priv,
1150                               struct iwl_link_quality_cmd *lq)
1151 {
1152         int i;
1153         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1154
1155         if (ht_conf->is_ht)
1156                 return true;
1157
1158         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
1159                        priv->active_rxon.channel);
1160         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1161                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
1162                         IWL_DEBUG_INFO(priv,
1163                                        "index %d of LQ expects HT channel\n",
1164                                        i);
1165                         return false;
1166                 }
1167         }
1168         return true;
1169 }
1170
1171 /**
1172  * iwl_send_lq_cmd() - Send link quality command
1173  * @init: This command is sent as part of station initialization right
1174  *        after station has been added.
1175  *
1176  * The link quality command is sent as the last step of station creation.
1177  * This is the special case in which init is set and we call a callback in
1178  * this case to clear the state indicating that station creation is in
1179  * progress.
1180  */
1181 int iwl_send_lq_cmd(struct iwl_priv *priv,
1182                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
1183 {
1184         int ret = 0;
1185         unsigned long flags_spin;
1186
1187         struct iwl_host_cmd cmd = {
1188                 .id = REPLY_TX_LINK_QUALITY_CMD,
1189                 .len = sizeof(struct iwl_link_quality_cmd),
1190                 .flags = flags,
1191                 .data = lq,
1192         };
1193
1194         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
1195                 return -EINVAL;
1196
1197         iwl_dump_lq_cmd(priv, lq);
1198         BUG_ON(init && (cmd.flags & CMD_ASYNC));
1199
1200         if (is_lq_table_valid(priv, lq))
1201                 ret = iwl_send_cmd(priv, &cmd);
1202         else
1203                 ret = -EINVAL;
1204
1205         if (cmd.flags & CMD_ASYNC)
1206                 return ret;
1207
1208         if (init) {
1209                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
1210                                lq->sta_id);
1211                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
1212                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
1213                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
1214         }
1215         return ret;
1216 }
1217 EXPORT_SYMBOL(iwl_send_lq_cmd);
1218
1219 /**
1220  * iwl_alloc_bcast_station - add broadcast station into driver's station table.
1221  *
1222  * This adds the broadcast station into the driver's station table
1223  * and marks it driver active, so that it will be restored to the
1224  * device at the next best time.
1225  */
1226 int iwl_alloc_bcast_station(struct iwl_priv *priv, bool init_lq)
1227 {
1228         struct iwl_link_quality_cmd *link_cmd;
1229         unsigned long flags;
1230         u8 sta_id;
1231
1232         spin_lock_irqsave(&priv->sta_lock, flags);
1233         sta_id = iwl_prep_station(priv, iwl_bcast_addr, false, NULL);
1234         if (sta_id == IWL_INVALID_STATION) {
1235                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1236                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1237
1238                 return -EINVAL;
1239         }
1240
1241         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1242         priv->stations[sta_id].used |= IWL_STA_BCAST;
1243         spin_unlock_irqrestore(&priv->sta_lock, flags);
1244
1245         if (init_lq) {
1246                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1247                 if (!link_cmd) {
1248                         IWL_ERR(priv,
1249                                 "Unable to initialize rate scaling for bcast station.\n");
1250                         return -ENOMEM;
1251                 }
1252
1253                 spin_lock_irqsave(&priv->sta_lock, flags);
1254                 priv->stations[sta_id].lq = link_cmd;
1255                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1256         }
1257
1258         return 0;
1259 }
1260 EXPORT_SYMBOL_GPL(iwl_alloc_bcast_station);
1261
1262 /**
1263  * iwl_update_bcast_station - update broadcast station's LQ command
1264  *
1265  * Only used by iwlagn. Placed here to have all bcast station management
1266  * code together.
1267  */
1268 int iwl_update_bcast_station(struct iwl_priv *priv)
1269 {
1270         unsigned long flags;
1271         struct iwl_link_quality_cmd *link_cmd;
1272         u8 sta_id = priv->hw_params.bcast_sta_id;
1273
1274         link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1275         if (!link_cmd) {
1276                 IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
1277                 return -ENOMEM;
1278         }
1279
1280         spin_lock_irqsave(&priv->sta_lock, flags);
1281         if (priv->stations[sta_id].lq)
1282                 kfree(priv->stations[sta_id].lq);
1283         else
1284                 IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
1285         priv->stations[sta_id].lq = link_cmd;
1286         spin_unlock_irqrestore(&priv->sta_lock, flags);
1287
1288         return 0;
1289 }
1290 EXPORT_SYMBOL_GPL(iwl_update_bcast_station);
1291
1292 void iwl_dealloc_bcast_station(struct iwl_priv *priv)
1293 {
1294         unsigned long flags;
1295         int i;
1296
1297         spin_lock_irqsave(&priv->sta_lock, flags);
1298         for (i = 0; i < priv->hw_params.max_stations; i++) {
1299                 if (!(priv->stations[i].used & IWL_STA_BCAST))
1300                         continue;
1301
1302                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
1303                 priv->num_stations--;
1304                 BUG_ON(priv->num_stations < 0);
1305                 kfree(priv->stations[i].lq);
1306                 priv->stations[i].lq = NULL;
1307         }
1308         spin_unlock_irqrestore(&priv->sta_lock, flags);
1309 }
1310 EXPORT_SYMBOL_GPL(iwl_dealloc_bcast_station);
1311
1312 /**
1313  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1314  */
1315 int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1316 {
1317         unsigned long flags;
1318         struct iwl_addsta_cmd sta_cmd;
1319
1320         lockdep_assert_held(&priv->mutex);
1321
1322         /* Remove "disable" flag, to enable Tx for this TID */
1323         spin_lock_irqsave(&priv->sta_lock, flags);
1324         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1325         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1326         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1327         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1328         spin_unlock_irqrestore(&priv->sta_lock, flags);
1329
1330         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1331 }
1332 EXPORT_SYMBOL(iwl_sta_tx_modify_enable_tid);
1333
1334 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1335                          int tid, u16 ssn)
1336 {
1337         unsigned long flags;
1338         int sta_id;
1339         struct iwl_addsta_cmd sta_cmd;
1340
1341         lockdep_assert_held(&priv->mutex);
1342
1343         sta_id = iwl_sta_id(sta);
1344         if (sta_id == IWL_INVALID_STATION)
1345                 return -ENXIO;
1346
1347         spin_lock_irqsave(&priv->sta_lock, flags);
1348         priv->stations[sta_id].sta.station_flags_msk = 0;
1349         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1350         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1351         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1352         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1353         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1354         spin_unlock_irqrestore(&priv->sta_lock, flags);
1355
1356         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1357 }
1358 EXPORT_SYMBOL(iwl_sta_rx_agg_start);
1359
1360 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1361                         int tid)
1362 {
1363         unsigned long flags;
1364         int sta_id;
1365         struct iwl_addsta_cmd sta_cmd;
1366
1367         lockdep_assert_held(&priv->mutex);
1368
1369         sta_id = iwl_sta_id(sta);
1370         if (sta_id == IWL_INVALID_STATION) {
1371                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1372                 return -ENXIO;
1373         }
1374
1375         spin_lock_irqsave(&priv->sta_lock, flags);
1376         priv->stations[sta_id].sta.station_flags_msk = 0;
1377         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1378         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1379         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1380         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1381         spin_unlock_irqrestore(&priv->sta_lock, flags);
1382
1383         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1384 }
1385 EXPORT_SYMBOL(iwl_sta_rx_agg_stop);
1386
1387 void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1388 {
1389         unsigned long flags;
1390
1391         spin_lock_irqsave(&priv->sta_lock, flags);
1392         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1393         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1394         priv->stations[sta_id].sta.sta.modify_mask = 0;
1395         priv->stations[sta_id].sta.sleep_tx_count = 0;
1396         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1397         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1398         spin_unlock_irqrestore(&priv->sta_lock, flags);
1399
1400 }
1401 EXPORT_SYMBOL(iwl_sta_modify_ps_wake);
1402
1403 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1404 {
1405         unsigned long flags;
1406
1407         spin_lock_irqsave(&priv->sta_lock, flags);
1408         priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
1409         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1410         priv->stations[sta_id].sta.sta.modify_mask =
1411                                         STA_MODIFY_SLEEP_TX_COUNT_MSK;
1412         priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
1413         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1414         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1415         spin_unlock_irqrestore(&priv->sta_lock, flags);
1416
1417 }
1418 EXPORT_SYMBOL(iwl_sta_modify_sleep_tx_count);
1419
1420 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
1421                        struct ieee80211_vif *vif,
1422                        struct ieee80211_sta *sta)
1423 {
1424         struct iwl_priv *priv = hw->priv;
1425         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
1426         int ret;
1427
1428         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
1429                         sta->addr);
1430         mutex_lock(&priv->mutex);
1431         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
1432                         sta->addr);
1433         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
1434         if (ret)
1435                 IWL_ERR(priv, "Error removing station %pM\n",
1436                         sta->addr);
1437         mutex_unlock(&priv->mutex);
1438         return ret;
1439 }
1440 EXPORT_SYMBOL(iwl_mac_sta_remove);