drivers/net/wireless/iwlwifi/iwl-agn-sta.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <net/mac80211.h>
  31
  32 #include "iwl-dev.h"
  33 #include "iwl-core.h"
  34 #include "iwl-agn.h"
  35 #include "iwl-trans.h"
  36
  37 /* priv->shrd->sta_lock must be held */
  38 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  39 {
  40
  41         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  42                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u "
  43                         "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 "
  49                                 "(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 {
  62         u8 sta_id = addsta->sta.sta_id;
  63         unsigned long flags;
  64         int ret = -EIO;
  65
  66         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  67                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  68                         pkt->hdr.flags);
  69                 return ret;
  70         }
  71
  72         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  73                        sta_id);
  74
  75         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
  76
  77         switch (pkt->u.add_sta.status) {
  78         case ADD_STA_SUCCESS_MSK:
  79                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  80                 iwl_sta_ucode_activate(priv, sta_id);
  81                 ret = 0;
  82                 break;
  83         case ADD_STA_NO_ROOM_IN_TABLE:
  84                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  85                         sta_id);
  86                 break;
  87         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  88                 IWL_ERR(priv, "Adding station %d failed, no block ack "
  89                         "resource.\n", sta_id);
  90                 break;
  91         case ADD_STA_MODIFY_NON_EXIST_STA:
  92                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  93                         sta_id);
  94                 break;
  95         default:
  96                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  97                                 pkt->u.add_sta.status);
  98                 break;
  99         }
 100
 101         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 102                        priv->stations[sta_id].sta.mode ==
 103                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 104                        sta_id, priv->stations[sta_id].sta.sta.addr);
 105
 106         /*
 107          * XXX: The MAC address in the command buffer is often changed from
 108          * the original sent to the device. That is, the MAC address
 109          * written to the command buffer often is not the same MAC address
 110          * read from the command buffer when the command returns. This
 111          * issue has not yet been resolved and this debugging is left to
 112          * observe the problem.
 113          */
 114         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 115                        priv->stations[sta_id].sta.mode ==
 116                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 117                        addsta->sta.addr);
 118         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 119
 120         return ret;
 121 }
 122
 123 int iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 124                                struct iwl_device_cmd *cmd)
 125 {
 126         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 127         struct iwl_addsta_cmd *addsta =
 128                 (struct iwl_addsta_cmd *) cmd->payload;
 129
 130         return iwl_process_add_sta_resp(priv, addsta, pkt);
 131 }
 132
 133 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 134 {
 135         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 136         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 137         memcpy(addsta, cmd, size);
 138         /* resrved in 5000 */
 139         addsta->rate_n_flags = cpu_to_le16(0);
 140         return size;
 141 }
 142
 143 int iwl_send_add_sta(struct iwl_priv *priv,
 144                      struct iwl_addsta_cmd *sta, u8 flags)
 145 {
 146         int ret = 0;
 147         u8 data[sizeof(*sta)];
 148         struct iwl_host_cmd cmd = {
 149                 .id = REPLY_ADD_STA,
 150                 .flags = flags,
 151                 .data = { data, },
 152         };
 153         u8 sta_id __maybe_unused = sta->sta.sta_id;
 154
 155         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 156                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 157
 158         if (!(flags & CMD_ASYNC)) {
 159                 cmd.flags |= CMD_WANT_SKB;
 160                 might_sleep();
 161         }
 162
 163         cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
 164         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 165
 166         if (ret || (flags & CMD_ASYNC))
 167                 return ret;
 168         /*else the command was successfully sent in SYNC mode, need to free
 169          * the reply page */
 170
 171         iwl_free_pages(priv->shrd, cmd.reply_page);
 172
 173         if (cmd.handler_status)
 174                 IWL_ERR(priv, "%s - error in the CMD response %d", __func__,
 175                         cmd.handler_status);
 176
 177         return cmd.handler_status;
 178 }
 179
 180 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 181                                    struct ieee80211_sta *sta,
 182                                    struct iwl_rxon_context *ctx)
 183 {
 184         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 185         __le32 sta_flags;
 186         u8 mimo_ps_mode;
 187
 188         if (!sta || !sta_ht_inf->ht_supported)
 189                 goto done;
 190
 191         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 192         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 193                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 194                         "static" :
 195                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 196                         "dynamic" : "disabled");
 197
 198         sta_flags = priv->stations[index].sta.station_flags;
 199
 200         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 201
 202         switch (mimo_ps_mode) {
 203         case WLAN_HT_CAP_SM_PS_STATIC:
 204                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 205                 break;
 206         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 207                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 208                 break;
 209         case WLAN_HT_CAP_SM_PS_DISABLED:
 210                 break;
 211         default:
 212                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 213                 break;
 214         }
 215
 216         sta_flags |= cpu_to_le32(
 217               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 218
 219         sta_flags |= cpu_to_le32(
 220               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 221
 222         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 223                 sta_flags |= STA_FLG_HT40_EN_MSK;
 224         else
 225                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 226
 227         priv->stations[index].sta.station_flags = sta_flags;
 228  done:
 229         return;
 230 }
 231
 232 /**
 233  * iwl_prep_station - Prepare station information for addition
 234  *
 235  * should be called with sta_lock held
 236  */
 237 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 238                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 239 {
 240         struct iwl_station_entry *station;
 241         int i;
 242         u8 sta_id = IWL_INVALID_STATION;
 243
 244         if (is_ap)
 245                 sta_id = ctx->ap_sta_id;
 246         else if (is_broadcast_ether_addr(addr))
 247                 sta_id = ctx->bcast_sta_id;
 248         else
 249                 for (i = IWL_STA_ID; i < IWLAGN_STATION_COUNT; i++) {
 250                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 251                                                 addr)) {
 252                                 sta_id = i;
 253                                 break;
 254                         }
 255
 256                         if (!priv->stations[i].used &&
 257                             sta_id == IWL_INVALID_STATION)
 258                                 sta_id = i;
 259                 }
 260
 261         /*
 262          * These two conditions have the same outcome, but keep them
 263          * separate
 264          */
 265         if (unlikely(sta_id == IWL_INVALID_STATION))
 266                 return sta_id;
 267
 268         /*
 269          * uCode is not able to deal with multiple requests to add a
 270          * station. Keep track if one is in progress so that we do not send
 271          * another.
 272          */
 273         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 274                 IWL_DEBUG_INFO(priv, "STA %d already in process of being "
 275                                "added.\n", sta_id);
 276                 return sta_id;
 277         }
 278
 279         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 280             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 281             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 282                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
 283                                 "adding again.\n", sta_id, addr);
 284                 return sta_id;
 285         }
 286
 287         station = &priv->stations[sta_id];
 288         station->used = IWL_STA_DRIVER_ACTIVE;
 289         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 290                         sta_id, addr);
 291         priv->num_stations++;
 292
 293         /* Set up the REPLY_ADD_STA command to send to device */
 294         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 295         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 296         station->sta.mode = 0;
 297         station->sta.sta.sta_id = sta_id;
 298         station->sta.station_flags = ctx->station_flags;
 299         station->ctxid = ctx->ctxid;
 300
 301         if (sta) {
 302                 struct iwl_station_priv *sta_priv;
 303
 304                 sta_priv = (void *)sta->drv_priv;
 305                 sta_priv->ctx = ctx;
 306         }
 307
 308         /*
 309          * OK to call unconditionally, since local stations (IBSS BSSID
 310          * STA and broadcast STA) pass in a NULL sta, and mac80211
 311          * doesn't allow HT IBSS.
 312          */
 313         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 314
 315         return sta_id;
 316
 317 }
 318
 319 #define STA_WAIT_TIMEOUT (HZ/2)
 320
 321 /**
 322  * iwl_add_station_common -
 323  */
 324 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 325                            const u8 *addr, bool is_ap,
 326                            struct ieee80211_sta *sta, u8 *sta_id_r)
 327 {
 328         unsigned long flags_spin;
 329         int ret = 0;
 330         u8 sta_id;
 331         struct iwl_addsta_cmd sta_cmd;
 332
 333         *sta_id_r = 0;
 334         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 335         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 336         if (sta_id == IWL_INVALID_STATION) {
 337                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 338                         addr);
 339                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 340                 return -EINVAL;
 341         }
 342
 343         /*
 344          * uCode is not able to deal with multiple requests to add a
 345          * station. Keep track if one is in progress so that we do not send
 346          * another.
 347          */
 348         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 349                 IWL_DEBUG_INFO(priv, "STA %d already in process of being "
 350                                "added.\n", sta_id);
 351                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 352                 return -EEXIST;
 353         }
 354
 355         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 356             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 357                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
 358                                 "adding again.\n", sta_id, addr);
 359                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 360                 return -EEXIST;
 361         }
 362
 363         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 364         memcpy(&sta_cmd, &priv->stations[sta_id].sta,
 365                sizeof(struct iwl_addsta_cmd));
 366         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 367
 368         /* Add station to device's station table */
 369         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 370         if (ret) {
 371                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 372                 IWL_ERR(priv, "Adding station %pM failed.\n",
 373                         priv->stations[sta_id].sta.sta.addr);
 374                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 375                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 376                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 377         }
 378         *sta_id_r = sta_id;
 379         return ret;
 380 }
 381
 382 /**
 383  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 384  *
 385  * priv->shrd->sta_lock must be held
 386  */
 387 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 388 {
 389         /* Ucode must be active and driver must be non active */
 390         if ((priv->stations[sta_id].used &
 391              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
 392               IWL_STA_UCODE_ACTIVE)
 393                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 394
 395         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 396
 397         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 398         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 399 }
 400
 401 static int iwl_send_remove_station(struct iwl_priv *priv,
 402                                    const u8 *addr, int sta_id,
 403                                    bool temporary)
 404 {
 405         struct iwl_rx_packet *pkt;
 406         int ret;
 407
 408         unsigned long flags_spin;
 409         struct iwl_rem_sta_cmd rm_sta_cmd;
 410
 411         struct iwl_host_cmd cmd = {
 412                 .id = REPLY_REMOVE_STA,
 413                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 414                 .flags = CMD_SYNC,
 415                 .data = { &rm_sta_cmd, },
 416         };
 417
 418         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 419         rm_sta_cmd.num_sta = 1;
 420         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 421
 422         cmd.flags |= CMD_WANT_SKB;
 423
 424         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 425
 426         if (ret)
 427                 return ret;
 428
 429         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 430         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 431                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 432                           pkt->hdr.flags);
 433                 ret = -EIO;
 434         }
 435
 436         if (!ret) {
 437                 switch (pkt->u.rem_sta.status) {
 438                 case REM_STA_SUCCESS_MSK:
 439                         if (!temporary) {
 440                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 441                                         flags_spin);
 442                                 iwl_sta_ucode_deactivate(priv, sta_id);
 443                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 444                                         flags_spin);
 445                         }
 446                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 447                         break;
 448                 default:
 449                         ret = -EIO;
 450                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 451                         break;
 452                 }
 453         }
 454         iwl_free_pages(priv->shrd, cmd.reply_page);
 455
 456         return ret;
 457 }
 458
 459 /**
 460  * iwl_remove_station - Remove driver's knowledge of station.
 461  */
 462 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 463                        const u8 *addr)
 464 {
 465         unsigned long flags;
 466
 467         if (!iwl_is_ready(priv->shrd)) {
 468                 IWL_DEBUG_INFO(priv,
 469                         "Unable to remove station %pM, device not ready.\n",
 470                         addr);
 471                 /*
 472                  * It is typical for stations to be removed when we are
 473                  * going down. Return success since device will be down
 474                  * soon anyway
 475                  */
 476                 return 0;
 477         }
 478
 479         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 480                         sta_id, addr);
 481
 482         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 483                 return -EINVAL;
 484
 485         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 486
 487         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 488                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 489                                 addr);
 490                 goto out_err;
 491         }
 492
 493         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 494                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 495                                 addr);
 496                 goto out_err;
 497         }
 498
 499         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 500                 kfree(priv->stations[sta_id].lq);
 501                 priv->stations[sta_id].lq = NULL;
 502         }
 503
 504         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 505
 506         priv->num_stations--;
 507
 508         if (WARN_ON(priv->num_stations < 0))
 509                 priv->num_stations = 0;
 510
 511         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 512
 513         return iwl_send_remove_station(priv, addr, sta_id, false);
 514 out_err:
 515         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 516         return -EINVAL;
 517 }
 518
 519 /**
 520  * iwl_clear_ucode_stations - clear ucode station table bits
 521  *
 522  * This function clears all the bits in the driver indicating
 523  * which stations are active in the ucode. Call when something
 524  * other than explicit station management would cause this in
 525  * the ucode, e.g. unassociated RXON.
 526  */
 527 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 528                               struct iwl_rxon_context *ctx)
 529 {
 530         int i;
 531         unsigned long flags_spin;
 532         bool cleared = false;
 533
 534         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 535
 536         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 537         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 538                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 539                         continue;
 540
 541                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 542                         IWL_DEBUG_INFO(priv,
 543                                 "Clearing ucode active for station %d\n", i);
 544                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 545                         cleared = true;
 546                 }
 547         }
 548         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 549
 550         if (!cleared)
 551                 IWL_DEBUG_INFO(priv,
 552                                "No active stations found to be cleared\n");
 553 }
 554
 555 /**
 556  * iwl_restore_stations() - Restore driver known stations to device
 557  *
 558  * All stations considered active by driver, but not present in ucode, is
 559  * restored.
 560  *
 561  * Function sleeps.
 562  */
 563 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 564 {
 565         struct iwl_addsta_cmd sta_cmd;
 566         static const struct iwl_link_quality_cmd zero_lq = {};
 567         struct iwl_link_quality_cmd lq;
 568         unsigned long flags_spin;
 569         int i;
 570         bool found = false;
 571         int ret;
 572         bool send_lq;
 573
 574         if (!iwl_is_ready(priv->shrd)) {
 575                 IWL_DEBUG_INFO(priv,
 576                                "Not ready yet, not restoring any stations.\n");
 577                 return;
 578         }
 579
 580         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 581         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 582         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 583                 if (ctx->ctxid != priv->stations[i].ctxid)
 584                         continue;
 585                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 586                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 587                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 588                                         priv->stations[i].sta.sta.addr);
 589                         priv->stations[i].sta.mode = 0;
 590                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 591                         found = true;
 592                 }
 593         }
 594
 595         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 596                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 597                         memcpy(&sta_cmd, &priv->stations[i].sta,
 598                                sizeof(struct iwl_addsta_cmd));
 599                         send_lq = false;
 600                         if (priv->stations[i].lq) {
 601                                 if (priv->shrd->wowlan)
 602                                         iwl_sta_fill_lq(priv, ctx, i, &lq);
 603                                 else
 604                                         memcpy(&lq, priv->stations[i].lq,
 605                                                sizeof(struct iwl_link_quality_cmd));
 606
 607                                 if (memcmp(&lq, &zero_lq, sizeof(lq)))
 608                                         send_lq = true;
 609                         }
 610                         spin_unlock_irqrestore(&priv->shrd->sta_lock,
 611                                                flags_spin);
 612                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 613                         if (ret) {
 614                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 615                                                   flags_spin);
 616                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 617                                         priv->stations[i].sta.sta.addr);
 618                                 priv->stations[i].used &=
 619                                                 ~IWL_STA_DRIVER_ACTIVE;
 620                                 priv->stations[i].used &=
 621                                                 ~IWL_STA_UCODE_INPROGRESS;
 622                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 623                                                        flags_spin);
 624                         }
 625                         /*
 626                          * Rate scaling has already been initialized, send
 627                          * current LQ command
 628                          */
 629                         if (send_lq)
 630                                 iwl_send_lq_cmd(priv, ctx, &lq,
 631                                                 CMD_SYNC, true);
 632                         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 633                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 634                 }
 635         }
 636
 637         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 638         if (!found)
 639                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
 640                         "no stations to be restored.\n");
 641         else
 642                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
 643                         "complete.\n");
 644 }
 645
 646 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 647 {
 648         unsigned long flags;
 649         int sta_id = ctx->ap_sta_id;
 650         int ret;
 651         struct iwl_addsta_cmd sta_cmd;
 652         struct iwl_link_quality_cmd lq;
 653         bool active;
 654
 655         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 656         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 657                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 658                 return;
 659         }
 660
 661         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 662         sta_cmd.mode = 0;
 663         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 664
 665         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 666         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 667         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 668
 669         if (active) {
 670                 ret = iwl_send_remove_station(
 671                         priv, priv->stations[sta_id].sta.sta.addr,
 672                         sta_id, true);
 673                 if (ret)
 674                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 675                                 priv->stations[sta_id].sta.sta.addr, ret);
 676         }
 677         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 678         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 679         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 680
 681         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 682         if (ret)
 683                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 684                         priv->stations[sta_id].sta.sta.addr, ret);
 685         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 686 }
 687
 688 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 689 {
 690         int i;
 691
 692         for (i = 0; i < priv->sta_key_max_num; i++)
 693                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 694                         return i;
 695
 696         return WEP_INVALID_OFFSET;
 697 }
 698
 699 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 700 {
 701         unsigned long flags;
 702         int i;
 703
 704         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 705         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 706                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 707                         continue;
 708
 709                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 710                 priv->num_stations--;
 711                 if (WARN_ON(priv->num_stations < 0))
 712                         priv->num_stations = 0;
 713                 kfree(priv->stations[i].lq);
 714                 priv->stations[i].lq = NULL;
 715         }
 716         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 717 }
 718
 719 #ifdef CONFIG_IWLWIFI_DEBUG
 720 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 721                            struct iwl_link_quality_cmd *lq)
 722 {
 723         int i;
 724         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 725         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 726                        lq->general_params.single_stream_ant_msk,
 727                        lq->general_params.dual_stream_ant_msk);
 728
 729         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 730                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 731                                i, lq->rs_table[i].rate_n_flags);
 732 }
 733 #else
 734 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 735                                    struct iwl_link_quality_cmd *lq)
 736 {
 737 }
 738 #endif
 739
 740 /**
 741  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 742  *
 743  * It sometimes happens when a HT rate has been in use and we
 744  * loose connectivity with AP then mac80211 will first tell us that the
 745  * current channel is not HT anymore before removing the station. In such a
 746  * scenario the RXON flags will be updated to indicate we are not
 747  * communicating HT anymore, but the LQ command may still contain HT rates.
 748  * Test for this to prevent driver from sending LQ command between the time
 749  * RXON flags are updated and when LQ command is updated.
 750  */
 751 static bool is_lq_table_valid(struct iwl_priv *priv,
 752                               struct iwl_rxon_context *ctx,
 753                               struct iwl_link_quality_cmd *lq)
 754 {
 755         int i;
 756
 757         if (ctx->ht.enabled)
 758                 return true;
 759
 760         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 761                        ctx->active.channel);
 762         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 763                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
 764                     RATE_MCS_HT_MSK) {
 765                         IWL_DEBUG_INFO(priv,
 766                                        "index %d of LQ expects HT channel\n",
 767                                        i);
 768                         return false;
 769                 }
 770         }
 771         return true;
 772 }
 773
 774 /**
 775  * iwl_send_lq_cmd() - Send link quality command
 776  * @init: This command is sent as part of station initialization right
 777  *        after station has been added.
 778  *
 779  * The link quality command is sent as the last step of station creation.
 780  * This is the special case in which init is set and we call a callback in
 781  * this case to clear the state indicating that station creation is in
 782  * progress.
 783  */
 784 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 785                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 786 {
 787         int ret = 0;
 788         unsigned long flags_spin;
 789
 790         struct iwl_host_cmd cmd = {
 791                 .id = REPLY_TX_LINK_QUALITY_CMD,
 792                 .len = { sizeof(struct iwl_link_quality_cmd), },
 793                 .flags = flags,
 794                 .data = { lq, },
 795         };
 796
 797         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 798                 return -EINVAL;
 799
 800
 801         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 802         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 803                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 804                 return -EINVAL;
 805         }
 806         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 807
 808         iwl_dump_lq_cmd(priv, lq);
 809         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 810                 return -EINVAL;
 811
 812         if (is_lq_table_valid(priv, ctx, lq))
 813                 ret = iwl_trans_send_cmd(trans(priv), &cmd);
 814         else
 815                 ret = -EINVAL;
 816
 817         if (cmd.flags & CMD_ASYNC)
 818                 return ret;
 819
 820         if (init) {
 821                 IWL_DEBUG_INFO(priv, "init LQ command complete, "
 822                                "clearing sta addition status for sta %d\n",
 823                                lq->sta_id);
 824                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 825                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 826                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 827         }
 828         return ret;
 829 }
 830
 831 int iwlagn_mac_sta_remove(struct ieee80211_hw *hw,
 832                        struct ieee80211_vif *vif,
 833                        struct ieee80211_sta *sta)
 834 {
 835         struct iwl_priv *priv = hw->priv;
 836         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 837         int ret;
 838
 839         IWL_DEBUG_MAC80211(priv, "enter: received request to remove "
 840                            "station %pM\n", sta->addr);
 841         mutex_lock(&priv->shrd->mutex);
 842         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 843                         sta->addr);
 844         ret = iwl_remove_station(priv, sta_priv->sta_id, sta->addr);
 845         if (ret)
 846                 IWL_ERR(priv, "Error removing station %pM\n",
 847                         sta->addr);
 848         mutex_unlock(&priv->shrd->mutex);
 849         IWL_DEBUG_MAC80211(priv, "leave\n");
 850
 851         return ret;
 852 }
 853
 854 void iwl_sta_fill_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 855                      u8 sta_id, struct iwl_link_quality_cmd *link_cmd)
 856 {
 857         int i, r;
 858         u32 rate_flags = 0;
 859         __le32 rate_n_flags;
 860
 861         lockdep_assert_held(&priv->shrd->mutex);
 862
 863         memset(link_cmd, 0, sizeof(*link_cmd));
 864
 865         /* Set up the rate scaling to start at selected rate, fall back
 866          * all the way down to 1M in IEEE order, and then spin on 1M */
 867         if (priv->band == IEEE80211_BAND_5GHZ)
 868                 r = IWL_RATE_6M_INDEX;
 869         else if (ctx && ctx->vif && ctx->vif->p2p)
 870                 r = IWL_RATE_6M_INDEX;
 871         else
 872                 r = IWL_RATE_1M_INDEX;
 873
 874         if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 875                 rate_flags |= RATE_MCS_CCK_MSK;
 876
 877         rate_flags |= first_antenna(hw_params(priv).valid_tx_ant) <<
 878                                 RATE_MCS_ANT_POS;
 879         rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 880         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 881                 link_cmd->rs_table[i].rate_n_flags = rate_n_flags;
 882
 883         link_cmd->general_params.single_stream_ant_msk =
 884                         first_antenna(hw_params(priv).valid_tx_ant);
 885
 886         link_cmd->general_params.dual_stream_ant_msk =
 887                 hw_params(priv).valid_tx_ant &
 888                 ~first_antenna(hw_params(priv).valid_tx_ant);
 889         if (!link_cmd->general_params.dual_stream_ant_msk) {
 890                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 891         } else if (num_of_ant(hw_params(priv).valid_tx_ant) == 2) {
 892                 link_cmd->general_params.dual_stream_ant_msk =
 893                         hw_params(priv).valid_tx_ant;
 894         }
 895
 896         link_cmd->agg_params.agg_dis_start_th =
 897                 LINK_QUAL_AGG_DISABLE_START_DEF;
 898         link_cmd->agg_params.agg_time_limit =
 899                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 900
 901         link_cmd->sta_id = sta_id;
 902 }
 903
 904 static struct iwl_link_quality_cmd *
 905 iwl_sta_alloc_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 906                  u8 sta_id)
 907 {
 908         struct iwl_link_quality_cmd *link_cmd;
 909
 910         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 911         if (!link_cmd) {
 912                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 913                 return NULL;
 914         }
 915
 916         iwl_sta_fill_lq(priv, ctx, sta_id, link_cmd);
 917
 918         return link_cmd;
 919 }
 920
 921 /*
 922  * iwlagn_add_bssid_station - Add the special IBSS BSSID station
 923  *
 924  * Function sleeps.
 925  */
 926 int iwlagn_add_bssid_station(struct iwl_priv *priv,
 927                              struct iwl_rxon_context *ctx,
 928                              const u8 *addr, u8 *sta_id_r)
 929 {
 930         int ret;
 931         u8 sta_id;
 932         struct iwl_link_quality_cmd *link_cmd;
 933         unsigned long flags;
 934
 935         if (sta_id_r)
 936                 *sta_id_r = IWL_INVALID_STATION;
 937
 938         ret = iwl_add_station_common(priv, ctx, addr, 0, NULL, &sta_id);
 939         if (ret) {
 940                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 941                 return ret;
 942         }
 943
 944         if (sta_id_r)
 945                 *sta_id_r = sta_id;
 946
 947         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 948         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 949         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 950
 951         /* Set up default rate scaling table in device's station table */
 952         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
 953         if (!link_cmd) {
 954                 IWL_ERR(priv,
 955                         "Unable to initialize rate scaling for station %pM.\n",
 956                         addr);
 957                 return -ENOMEM;
 958         }
 959
 960         ret = iwl_send_lq_cmd(priv, ctx, link_cmd, CMD_SYNC, true);
 961         if (ret)
 962                 IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 963
 964         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 965         priv->stations[sta_id].lq = link_cmd;
 966         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 967
 968         return 0;
 969 }
 970
 971 /*
 972  * static WEP keys
 973  *
 974  * For each context, the device has a table of 4 static WEP keys
 975  * (one for each key index) that is updated with the following
 976  * commands.
 977  */
 978
 979 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv,
 980                                       struct iwl_rxon_context *ctx,
 981                                       bool send_if_empty)
 982 {
 983         int i, not_empty = 0;
 984         u8 buff[sizeof(struct iwl_wep_cmd) +
 985                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 986         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 987         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 988         struct iwl_host_cmd cmd = {
 989                 .id = ctx->wep_key_cmd,
 990                 .data = { wep_cmd, },
 991                 .flags = CMD_SYNC,
 992         };
 993
 994         might_sleep();
 995
 996         memset(wep_cmd, 0, cmd_size +
 997                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 998
 999         for (i = 0; i < WEP_KEYS_MAX ; i++) {
1000                 wep_cmd->key[i].key_index = i;
1001                 if (ctx->wep_keys[i].key_size) {
1002                         wep_cmd->key[i].key_offset = i;
1003                         not_empty = 1;
1004                 } else {
1005                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
1006                 }
1007
1008                 wep_cmd->key[i].key_size = ctx->wep_keys[i].key_size;
1009                 memcpy(&wep_cmd->key[i].key[3], ctx->wep_keys[i].key,
1010                                 ctx->wep_keys[i].key_size);
1011         }
1012
1013         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
1014         wep_cmd->num_keys = WEP_KEYS_MAX;
1015
1016         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
1017
1018         cmd.len[0] = cmd_size;
1019
1020         if (not_empty || send_if_empty)
1021                 return iwl_trans_send_cmd(trans(priv), &cmd);
1022         else
1023                 return 0;
1024 }
1025
1026 int iwl_restore_default_wep_keys(struct iwl_priv *priv,
1027                                  struct iwl_rxon_context *ctx)
1028 {
1029         lockdep_assert_held(&priv->shrd->mutex);
1030
1031         return iwl_send_static_wepkey_cmd(priv, ctx, false);
1032 }
1033
1034 int iwl_remove_default_wep_key(struct iwl_priv *priv,
1035                                struct iwl_rxon_context *ctx,
1036                                struct ieee80211_key_conf *keyconf)
1037 {
1038         int ret;
1039
1040         lockdep_assert_held(&priv->shrd->mutex);
1041
1042         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
1043                       keyconf->keyidx);
1044
1045         memset(&ctx->wep_keys[keyconf->keyidx], 0, sizeof(ctx->wep_keys[0]));
1046         if (iwl_is_rfkill(priv->shrd)) {
1047                 IWL_DEBUG_WEP(priv,
1048                         "Not sending REPLY_WEPKEY command due to RFKILL.\n");
1049                 /* but keys in device are clear anyway so return success */
1050                 return 0;
1051         }
1052         ret = iwl_send_static_wepkey_cmd(priv, ctx, 1);
1053         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
1054                       keyconf->keyidx, ret);
1055
1056         return ret;
1057 }
1058
1059 int iwl_set_default_wep_key(struct iwl_priv *priv,
1060                             struct iwl_rxon_context *ctx,
1061                             struct ieee80211_key_conf *keyconf)
1062 {
1063         int ret;
1064
1065         lockdep_assert_held(&priv->shrd->mutex);
1066
1067         if (keyconf->keylen != WEP_KEY_LEN_128 &&
1068             keyconf->keylen != WEP_KEY_LEN_64) {
1069                 IWL_DEBUG_WEP(priv,
1070                               "Bad WEP key length %d\n", keyconf->keylen);
1071                 return -EINVAL;
1072         }
1073
1074         keyconf->hw_key_idx = IWLAGN_HW_KEY_DEFAULT;
1075
1076         ctx->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
1077         memcpy(&ctx->wep_keys[keyconf->keyidx].key, &keyconf->key,
1078                                                         keyconf->keylen);
1079
1080         ret = iwl_send_static_wepkey_cmd(priv, ctx, false);
1081         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
1082                 keyconf->keylen, keyconf->keyidx, ret);
1083
1084         return ret;
1085 }
1086
1087 /*
1088  * dynamic (per-station) keys
1089  *
1090  * The dynamic keys are a little more complicated. The device has
1091  * a key cache of up to STA_KEY_MAX_NUM/STA_KEY_MAX_NUM_PAN keys.
1092  * These are linked to stations by a table that contains an index
1093  * into the key table for each station/key index/{mcast,unicast},
1094  * i.e. it's basically an array of pointers like this:
1095  *      key_offset_t key_mapping[NUM_STATIONS][4][2];
1096  * (it really works differently, but you can think of it as such)
1097  *
1098  * The key uploading and linking happens in the same command, the
1099  * add station command with STA_MODIFY_KEY_MASK.
1100  */
1101
1102 static u8 iwlagn_key_sta_id(struct iwl_priv *priv,
1103                             struct ieee80211_vif *vif,
1104                             struct ieee80211_sta *sta)
1105 {
1106         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1107         u8 sta_id = IWL_INVALID_STATION;
1108
1109         if (sta)
1110                 sta_id = iwl_sta_id(sta);
1111
1112         /*
1113          * The device expects GTKs for station interfaces to be
1114          * installed as GTKs for the AP station. If we have no
1115          * station ID, then use the ap_sta_id in that case.
1116          */
1117         if (!sta && vif && vif_priv->ctx) {
1118                 switch (vif->type) {
1119                 case NL80211_IFTYPE_STATION:
1120                         sta_id = vif_priv->ctx->ap_sta_id;
1121                         break;
1122                 default:
1123                         /*
1124                          * In all other cases, the key will be
1125                          * used either for TX only or is bound
1126                          * to a station already.
1127                          */
1128                         break;
1129                 }
1130         }
1131
1132         return sta_id;
1133 }
1134
1135 static int iwlagn_send_sta_key(struct iwl_priv *priv,
1136                                struct ieee80211_key_conf *keyconf,
1137                                u8 sta_id, u32 tkip_iv32, u16 *tkip_p1k,
1138                                u32 cmd_flags)
1139 {
1140         unsigned long flags;
1141         __le16 key_flags;
1142         struct iwl_addsta_cmd sta_cmd;
1143         int i;
1144
1145         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1146         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
1147         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1148
1149         key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
1150         key_flags |= STA_KEY_FLG_MAP_KEY_MSK;
1151
1152         switch (keyconf->cipher) {
1153         case WLAN_CIPHER_SUITE_CCMP:
1154                 key_flags |= STA_KEY_FLG_CCMP;
1155                 memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
1156                 break;
1157         case WLAN_CIPHER_SUITE_TKIP:
1158                 key_flags |= STA_KEY_FLG_TKIP;
1159                 sta_cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
1160                 for (i = 0; i < 5; i++)
1161                         sta_cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
1162                 memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
1163                 break;
1164         case WLAN_CIPHER_SUITE_WEP104:
1165                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
1166                 /* fall through */
1167         case WLAN_CIPHER_SUITE_WEP40:
1168                 key_flags |= STA_KEY_FLG_WEP;
1169                 memcpy(&sta_cmd.key.key[3], keyconf->key, keyconf->keylen);
1170                 break;
1171         default:
1172                 WARN_ON(1);
1173                 return -EINVAL;
1174         }
1175
1176         if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
1177                 key_flags |= STA_KEY_MULTICAST_MSK;
1178
1179         /* key pointer (offset) */
1180         sta_cmd.key.key_offset = keyconf->hw_key_idx;
1181
1182         sta_cmd.key.key_flags = key_flags;
1183         sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
1184         sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
1185
1186         return iwl_send_add_sta(priv, &sta_cmd, cmd_flags);
1187 }
1188
1189 void iwl_update_tkip_key(struct iwl_priv *priv,
1190                          struct ieee80211_vif *vif,
1191                          struct ieee80211_key_conf *keyconf,
1192                          struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
1193 {
1194         u8 sta_id = iwlagn_key_sta_id(priv, vif, sta);
1195
1196         if (sta_id == IWL_INVALID_STATION)
1197                 return;
1198
1199         if (iwl_scan_cancel(priv)) {
1200                 /* cancel scan failed, just live w/ bad key and rely
1201                    briefly on SW decryption */
1202                 return;
1203         }
1204
1205         iwlagn_send_sta_key(priv, keyconf, sta_id,
1206                             iv32, phase1key, CMD_ASYNC);
1207 }
1208
1209 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1210                            struct iwl_rxon_context *ctx,
1211                            struct ieee80211_key_conf *keyconf,
1212                            struct ieee80211_sta *sta)
1213 {
1214         unsigned long flags;
1215         struct iwl_addsta_cmd sta_cmd;
1216         u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
1217         __le16 key_flags;
1218
1219         /* if station isn't there, neither is the key */
1220         if (sta_id == IWL_INVALID_STATION)
1221                 return -ENOENT;
1222
1223         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1224         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
1225         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE))
1226                 sta_id = IWL_INVALID_STATION;
1227         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1228
1229         if (sta_id == IWL_INVALID_STATION)
1230                 return 0;
1231
1232         lockdep_assert_held(&priv->shrd->mutex);
1233
1234         ctx->key_mapping_keys--;
1235
1236         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1237                       keyconf->keyidx, sta_id);
1238
1239         if (!test_and_clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table))
1240                 IWL_ERR(priv, "offset %d not used in uCode key table.\n",
1241                         keyconf->hw_key_idx);
1242
1243         key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
1244         key_flags |= STA_KEY_FLG_MAP_KEY_MSK | STA_KEY_FLG_NO_ENC |
1245                      STA_KEY_FLG_INVALID;
1246
1247         if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
1248                 key_flags |= STA_KEY_MULTICAST_MSK;
1249
1250         sta_cmd.key.key_flags = key_flags;
1251         sta_cmd.key.key_offset = keyconf->hw_key_idx;
1252         sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
1253         sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
1254
1255         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1256 }
1257
1258 int iwl_set_dynamic_key(struct iwl_priv *priv,
1259                         struct iwl_rxon_context *ctx,
1260                         struct ieee80211_key_conf *keyconf,
1261                         struct ieee80211_sta *sta)
1262 {
1263         struct ieee80211_key_seq seq;
1264         u16 p1k[5];
1265         int ret;
1266         u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
1267         const u8 *addr;
1268
1269         if (sta_id == IWL_INVALID_STATION)
1270                 return -EINVAL;
1271
1272         lockdep_assert_held(&priv->shrd->mutex);
1273
1274         keyconf->hw_key_idx = iwl_get_free_ucode_key_offset(priv);
1275         if (keyconf->hw_key_idx == WEP_INVALID_OFFSET)
1276                 return -ENOSPC;
1277
1278         ctx->key_mapping_keys++;
1279
1280         switch (keyconf->cipher) {
1281         case WLAN_CIPHER_SUITE_TKIP:
1282                 if (sta)
1283                         addr = sta->addr;
1284                 else /* station mode case only */
1285                         addr = ctx->active.bssid_addr;
1286
1287                 /* pre-fill phase 1 key into device cache */
1288                 ieee80211_get_key_rx_seq(keyconf, 0, &seq);
1289                 ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
1290                 ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
1291                                           seq.tkip.iv32, p1k, CMD_SYNC);
1292                 break;
1293         case WLAN_CIPHER_SUITE_CCMP:
1294         case WLAN_CIPHER_SUITE_WEP40:
1295         case WLAN_CIPHER_SUITE_WEP104:
1296                 ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
1297                                           0, NULL, CMD_SYNC);
1298                 break;
1299         default:
1300                 IWL_ERR(priv, "Unknown cipher %x\n", keyconf->cipher);
1301                 ret = -EINVAL;
1302         }
1303
1304         if (ret) {
1305                 ctx->key_mapping_keys--;
1306                 clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table);
1307         }
1308
1309         IWL_DEBUG_WEP(priv, "Set dynamic key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
1310                       keyconf->cipher, keyconf->keylen, keyconf->keyidx,
1311                       sta ? sta->addr : NULL, ret);
1312
1313         return ret;
1314 }
1315
1316 /**
1317  * iwlagn_alloc_bcast_station - add broadcast station into driver's station table.
1318  *
1319  * This adds the broadcast station into the driver's station table
1320  * and marks it driver active, so that it will be restored to the
1321  * device at the next best time.
1322  */
1323 int iwlagn_alloc_bcast_station(struct iwl_priv *priv,
1324                                struct iwl_rxon_context *ctx)
1325 {
1326         struct iwl_link_quality_cmd *link_cmd;
1327         unsigned long flags;
1328         u8 sta_id;
1329
1330         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1331         sta_id = iwl_prep_station(priv, ctx, iwl_bcast_addr, false, NULL);
1332         if (sta_id == IWL_INVALID_STATION) {
1333                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1334                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1335
1336                 return -EINVAL;
1337         }
1338
1339         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1340         priv->stations[sta_id].used |= IWL_STA_BCAST;
1341         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1342
1343         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
1344         if (!link_cmd) {
1345                 IWL_ERR(priv,
1346                         "Unable to initialize rate scaling for bcast station.\n");
1347                 return -ENOMEM;
1348         }
1349
1350         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1351         priv->stations[sta_id].lq = link_cmd;
1352         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1353
1354         return 0;
1355 }
1356
1357 /**
1358  * iwl_update_bcast_station - update broadcast station's LQ command
1359  *
1360  * Only used by iwlagn. Placed here to have all bcast station management
1361  * code together.
1362  */
1363 int iwl_update_bcast_station(struct iwl_priv *priv,
1364                              struct iwl_rxon_context *ctx)
1365 {
1366         unsigned long flags;
1367         struct iwl_link_quality_cmd *link_cmd;
1368         u8 sta_id = ctx->bcast_sta_id;
1369
1370         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
1371         if (!link_cmd) {
1372                 IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
1373                 return -ENOMEM;
1374         }
1375
1376         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1377         if (priv->stations[sta_id].lq)
1378                 kfree(priv->stations[sta_id].lq);
1379         else
1380                 IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
1381         priv->stations[sta_id].lq = link_cmd;
1382         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1383
1384         return 0;
1385 }
1386
1387 int iwl_update_bcast_stations(struct iwl_priv *priv)
1388 {
1389         struct iwl_rxon_context *ctx;
1390         int ret = 0;
1391
1392         for_each_context(priv, ctx) {
1393                 ret = iwl_update_bcast_station(priv, ctx);
1394                 if (ret)
1395                         break;
1396         }
1397
1398         return ret;
1399 }
1400
1401 /**
1402  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1403  */
1404 int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1405 {
1406         unsigned long flags;
1407         struct iwl_addsta_cmd sta_cmd;
1408
1409         lockdep_assert_held(&priv->shrd->mutex);
1410
1411         /* Remove "disable" flag, to enable Tx for this TID */
1412         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1413         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1414         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1415         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1416         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1417         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1418
1419         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1420 }
1421
1422 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1423                          int tid, u16 ssn)
1424 {
1425         unsigned long flags;
1426         int sta_id;
1427         struct iwl_addsta_cmd sta_cmd;
1428
1429         lockdep_assert_held(&priv->shrd->mutex);
1430
1431         sta_id = iwl_sta_id(sta);
1432         if (sta_id == IWL_INVALID_STATION)
1433                 return -ENXIO;
1434
1435         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1436         priv->stations[sta_id].sta.station_flags_msk = 0;
1437         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1438         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1439         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1440         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1441         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1442         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1443
1444         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1445 }
1446
1447 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1448                         int tid)
1449 {
1450         unsigned long flags;
1451         int sta_id;
1452         struct iwl_addsta_cmd sta_cmd;
1453
1454         lockdep_assert_held(&priv->shrd->mutex);
1455
1456         sta_id = iwl_sta_id(sta);
1457         if (sta_id == IWL_INVALID_STATION) {
1458                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1459                 return -ENXIO;
1460         }
1461
1462         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1463         priv->stations[sta_id].sta.station_flags_msk = 0;
1464         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1465         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1466         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1467         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1468         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1469
1470         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1471 }
1472
1473 static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1474 {
1475         unsigned long flags;
1476
1477         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1478         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1479         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1480         priv->stations[sta_id].sta.sta.modify_mask = 0;
1481         priv->stations[sta_id].sta.sleep_tx_count = 0;
1482         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1483         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1484         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1485
1486 }
1487
1488 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1489 {
1490         unsigned long flags;
1491
1492         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1493         priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
1494         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1495         priv->stations[sta_id].sta.sta.modify_mask =
1496                                         STA_MODIFY_SLEEP_TX_COUNT_MSK;
1497         priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
1498         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1499         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1500         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1501
1502 }
1503
1504 void iwlagn_mac_sta_notify(struct ieee80211_hw *hw,
1505                            struct ieee80211_vif *vif,
1506                            enum sta_notify_cmd cmd,
1507                            struct ieee80211_sta *sta)
1508 {
1509         struct iwl_priv *priv = hw->priv;
1510         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1511         int sta_id;
1512
1513         IWL_DEBUG_MAC80211(priv, "enter\n");
1514
1515         switch (cmd) {
1516         case STA_NOTIFY_SLEEP:
1517                 WARN_ON(!sta_priv->client);
1518                 sta_priv->asleep = true;
1519                 if (atomic_read(&sta_priv->pending_frames) > 0)
1520                         ieee80211_sta_block_awake(hw, sta, true);
1521                 break;
1522         case STA_NOTIFY_AWAKE:
1523                 WARN_ON(!sta_priv->client);
1524                 if (!sta_priv->asleep)
1525                         break;
1526                 sta_priv->asleep = false;
1527                 sta_id = iwl_sta_id(sta);
1528                 if (sta_id != IWL_INVALID_STATION)
1529                         iwl_sta_modify_ps_wake(priv, sta_id);
1530                 break;
1531         default:
1532                 break;
1533         }
1534         IWL_DEBUG_MAC80211(priv, "leave\n");
1535 }