drivers/net/wireless/iwlegacy/iwl-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 #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_legacy_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,
  45                         "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  46                         sta_id, priv->stations[sta_id].sta.sta.addr);
  47
  48         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  49                 IWL_DEBUG_ASSOC(priv,
  50                         "STA id %u addr %pM already present"
  51                         " in uCode (according to driver)\n",
  52                         sta_id, priv->stations[sta_id].sta.sta.addr);
  53         } else {
  54                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  55                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  56                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  57         }
  58 }
  59
  60 static int iwl_legacy_process_add_sta_resp(struct iwl_priv *priv,
  61                                     struct iwl_legacy_addsta_cmd *addsta,
  62                                     struct iwl_rx_packet *pkt,
  63                                     bool sync)
  64 {
  65         u8 sta_id = addsta->sta.sta_id;
  66         unsigned long flags;
  67         int ret = -EIO;
  68
  69         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  70                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  71                         pkt->hdr.flags);
  72                 return ret;
  73         }
  74
  75         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  76                        sta_id);
  77
  78         spin_lock_irqsave(&priv->sta_lock, flags);
  79
  80         switch (pkt->u.add_sta.status) {
  81         case ADD_STA_SUCCESS_MSK:
  82                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  83                 iwl_legacy_sta_ucode_activate(priv, sta_id);
  84                 ret = 0;
  85                 break;
  86         case ADD_STA_NO_ROOM_IN_TABLE:
  87                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  88                         sta_id);
  89                 break;
  90         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  91                 IWL_ERR(priv,
  92                         "Adding station %d failed, no block ack resource.\n",
  93                         sta_id);
  94                 break;
  95         case ADD_STA_MODIFY_NON_EXIST_STA:
  96                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  97                         sta_id);
  98                 break;
  99         default:
 100                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
 101                                 pkt->u.add_sta.status);
 102                 break;
 103         }
 104
 105         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 106                        priv->stations[sta_id].sta.mode ==
 107                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 108                        sta_id, priv->stations[sta_id].sta.sta.addr);
 109
 110         /*
 111          * XXX: The MAC address in the command buffer is often changed from
 112          * the original sent to the device. That is, the MAC address
 113          * written to the command buffer often is not the same MAC address
 114          * read from the command buffer when the command returns. This
 115          * issue has not yet been resolved and this debugging is left to
 116          * observe the problem.
 117          */
 118         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 119                        priv->stations[sta_id].sta.mode ==
 120                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 121                        addsta->sta.addr);
 122         spin_unlock_irqrestore(&priv->sta_lock, flags);
 123
 124         return ret;
 125 }
 126
 127 static void iwl_legacy_add_sta_callback(struct iwl_priv *priv,
 128                                  struct iwl_device_cmd *cmd,
 129                                  struct iwl_rx_packet *pkt)
 130 {
 131         struct iwl_legacy_addsta_cmd *addsta =
 132                 (struct iwl_legacy_addsta_cmd *)cmd->cmd.payload;
 133
 134         iwl_legacy_process_add_sta_resp(priv, addsta, pkt, false);
 135
 136 }
 137
 138 int iwl_legacy_send_add_sta(struct iwl_priv *priv,
 139                      struct iwl_legacy_addsta_cmd *sta, u8 flags)
 140 {
 141         struct iwl_rx_packet *pkt = NULL;
 142         int ret = 0;
 143         u8 data[sizeof(*sta)];
 144         struct iwl_host_cmd cmd = {
 145                 .id = REPLY_ADD_STA,
 146                 .flags = flags,
 147                 .data = data,
 148         };
 149         u8 sta_id __maybe_unused = sta->sta.sta_id;
 150
 151         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 152                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 153
 154         if (flags & CMD_ASYNC)
 155                 cmd.callback = iwl_legacy_add_sta_callback;
 156         else {
 157                 cmd.flags |= CMD_WANT_SKB;
 158                 might_sleep();
 159         }
 160
 161         cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 162         ret = iwl_legacy_send_cmd(priv, &cmd);
 163
 164         if (ret || (flags & CMD_ASYNC))
 165                 return ret;
 166
 167         if (ret == 0) {
 168                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 169                 ret = iwl_legacy_process_add_sta_resp(priv, sta, pkt, true);
 170         }
 171         iwl_legacy_free_pages(priv, cmd.reply_page);
 172
 173         return ret;
 174 }
 175 EXPORT_SYMBOL(iwl_legacy_send_add_sta);
 176
 177 static void iwl_legacy_set_ht_add_station(struct iwl_priv *priv, u8 index,
 178                                    struct ieee80211_sta *sta,
 179                                    struct iwl_rxon_context *ctx)
 180 {
 181         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 182         __le32 sta_flags;
 183         u8 mimo_ps_mode;
 184
 185         if (!sta || !sta_ht_inf->ht_supported)
 186                 goto done;
 187
 188         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 189         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 190                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 191                         "static" :
 192                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 193                         "dynamic" : "disabled");
 194
 195         sta_flags = priv->stations[index].sta.station_flags;
 196
 197         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 198
 199         switch (mimo_ps_mode) {
 200         case WLAN_HT_CAP_SM_PS_STATIC:
 201                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 202                 break;
 203         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 204                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 205                 break;
 206         case WLAN_HT_CAP_SM_PS_DISABLED:
 207                 break;
 208         default:
 209                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 210                 break;
 211         }
 212
 213         sta_flags |= cpu_to_le32(
 214               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 215
 216         sta_flags |= cpu_to_le32(
 217               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 218
 219         if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 220                 sta_flags |= STA_FLG_HT40_EN_MSK;
 221         else
 222                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 223
 224         priv->stations[index].sta.station_flags = sta_flags;
 225  done:
 226         return;
 227 }
 228
 229 /**
 230  * iwl_legacy_prep_station - Prepare station information for addition
 231  *
 232  * should be called with sta_lock held
 233  */
 234 u8 iwl_legacy_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 235                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 236 {
 237         struct iwl_station_entry *station;
 238         int i;
 239         u8 sta_id = IWL_INVALID_STATION;
 240         u16 rate;
 241
 242         if (is_ap)
 243                 sta_id = ctx->ap_sta_id;
 244         else if (is_broadcast_ether_addr(addr))
 245                 sta_id = ctx->bcast_sta_id;
 246         else
 247                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 248                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 249                                                 addr)) {
 250                                 sta_id = i;
 251                                 break;
 252                         }
 253
 254                         if (!priv->stations[i].used &&
 255                             sta_id == IWL_INVALID_STATION)
 256                                 sta_id = i;
 257                 }
 258
 259         /*
 260          * These two conditions have the same outcome, but keep them
 261          * separate
 262          */
 263         if (unlikely(sta_id == IWL_INVALID_STATION))
 264                 return sta_id;
 265
 266         /*
 267          * uCode is not able to deal with multiple requests to add a
 268          * station. Keep track if one is in progress so that we do not send
 269          * another.
 270          */
 271         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 272                 IWL_DEBUG_INFO(priv,
 273                                 "STA %d already in process of being added.\n",
 274                                 sta_id);
 275                 return sta_id;
 276         }
 277
 278         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 279             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 280             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 281                 IWL_DEBUG_ASSOC(priv,
 282                                 "STA %d (%pM) already added, not adding again.\n",
 283                                 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_legacy_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_common *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_legacy_set_ht_add_station(priv, sta_id, sta, ctx);
 314
 315         /* 3945 only */
 316         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 317                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 318         /* Turn on both antennas for the station... */
 319         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 320
 321         return sta_id;
 322
 323 }
 324 EXPORT_SYMBOL_GPL(iwl_legacy_prep_station);
 325
 326 #define STA_WAIT_TIMEOUT (HZ/2)
 327
 328 /**
 329  * iwl_legacy_add_station_common -
 330  */
 331 int
 332 iwl_legacy_add_station_common(struct iwl_priv *priv,
 333                         struct iwl_rxon_context *ctx,
 334                            const u8 *addr, bool is_ap,
 335                            struct ieee80211_sta *sta, u8 *sta_id_r)
 336 {
 337         unsigned long flags_spin;
 338         int ret = 0;
 339         u8 sta_id;
 340         struct iwl_legacy_addsta_cmd sta_cmd;
 341
 342         *sta_id_r = 0;
 343         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 344         sta_id = iwl_legacy_prep_station(priv, ctx, addr, is_ap, sta);
 345         if (sta_id == IWL_INVALID_STATION) {
 346                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 347                         addr);
 348                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 349                 return -EINVAL;
 350         }
 351
 352         /*
 353          * uCode is not able to deal with multiple requests to add a
 354          * station. Keep track if one is in progress so that we do not send
 355          * another.
 356          */
 357         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 358                 IWL_DEBUG_INFO(priv,
 359                         "STA %d already in process of being added.\n",
 360                        sta_id);
 361                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 362                 return -EEXIST;
 363         }
 364
 365         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 366             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 367                 IWL_DEBUG_ASSOC(priv,
 368                         "STA %d (%pM) already added, not adding again.\n",
 369                         sta_id, addr);
 370                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 371                 return -EEXIST;
 372         }
 373
 374         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 375         memcpy(&sta_cmd, &priv->stations[sta_id].sta,
 376                                 sizeof(struct iwl_legacy_addsta_cmd));
 377         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 378
 379         /* Add station to device's station table */
 380         ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 381         if (ret) {
 382                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 383                 IWL_ERR(priv, "Adding station %pM failed.\n",
 384                         priv->stations[sta_id].sta.sta.addr);
 385                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 386                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 387                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 388         }
 389         *sta_id_r = sta_id;
 390         return ret;
 391 }
 392 EXPORT_SYMBOL(iwl_legacy_add_station_common);
 393
 394 /**
 395  * iwl_legacy_sta_ucode_deactivate - deactivate ucode status for a station
 396  *
 397  * priv->sta_lock must be held
 398  */
 399 static void iwl_legacy_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 400 {
 401         /* Ucode must be active and driver must be non active */
 402         if ((priv->stations[sta_id].used &
 403              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
 404                                                 IWL_STA_UCODE_ACTIVE)
 405                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 406
 407         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 408
 409         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 410         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 411 }
 412
 413 static int iwl_legacy_send_remove_station(struct iwl_priv *priv,
 414                                    const u8 *addr, int sta_id,
 415                                    bool temporary)
 416 {
 417         struct iwl_rx_packet *pkt;
 418         int ret;
 419
 420         unsigned long flags_spin;
 421         struct iwl_rem_sta_cmd rm_sta_cmd;
 422
 423         struct iwl_host_cmd cmd = {
 424                 .id = REPLY_REMOVE_STA,
 425                 .len = sizeof(struct iwl_rem_sta_cmd),
 426                 .flags = CMD_SYNC,
 427                 .data = &rm_sta_cmd,
 428         };
 429
 430         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 431         rm_sta_cmd.num_sta = 1;
 432         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 433
 434         cmd.flags |= CMD_WANT_SKB;
 435
 436         ret = iwl_legacy_send_cmd(priv, &cmd);
 437
 438         if (ret)
 439                 return ret;
 440
 441         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 442         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 443                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 444                           pkt->hdr.flags);
 445                 ret = -EIO;
 446         }
 447
 448         if (!ret) {
 449                 switch (pkt->u.rem_sta.status) {
 450                 case REM_STA_SUCCESS_MSK:
 451                         if (!temporary) {
 452                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 453                                 iwl_legacy_sta_ucode_deactivate(priv, sta_id);
 454                                 spin_unlock_irqrestore(&priv->sta_lock,
 455                                                                 flags_spin);
 456                         }
 457                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 458                         break;
 459                 default:
 460                         ret = -EIO;
 461                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 462                         break;
 463                 }
 464         }
 465         iwl_legacy_free_pages(priv, cmd.reply_page);
 466
 467         return ret;
 468 }
 469
 470 /**
 471  * iwl_legacy_remove_station - Remove driver's knowledge of station.
 472  */
 473 int iwl_legacy_remove_station(struct iwl_priv *priv, const u8 sta_id,
 474                        const u8 *addr)
 475 {
 476         unsigned long flags;
 477
 478         if (!iwl_legacy_is_ready(priv)) {
 479                 IWL_DEBUG_INFO(priv,
 480                         "Unable to remove station %pM, device not ready.\n",
 481                         addr);
 482                 /*
 483                  * It is typical for stations to be removed when we are
 484                  * going down. Return success since device will be down
 485                  * soon anyway
 486                  */
 487                 return 0;
 488         }
 489
 490         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 491                         sta_id, addr);
 492
 493         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 494                 return -EINVAL;
 495
 496         spin_lock_irqsave(&priv->sta_lock, flags);
 497
 498         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 499                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 500                                 addr);
 501                 goto out_err;
 502         }
 503
 504         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 505                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 506                                 addr);
 507                 goto out_err;
 508         }
 509
 510         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 511                 kfree(priv->stations[sta_id].lq);
 512                 priv->stations[sta_id].lq = NULL;
 513         }
 514
 515         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 516
 517         priv->num_stations--;
 518
 519         BUG_ON(priv->num_stations < 0);
 520
 521         spin_unlock_irqrestore(&priv->sta_lock, flags);
 522
 523         return iwl_legacy_send_remove_station(priv, addr, sta_id, false);
 524 out_err:
 525         spin_unlock_irqrestore(&priv->sta_lock, flags);
 526         return -EINVAL;
 527 }
 528 EXPORT_SYMBOL_GPL(iwl_legacy_remove_station);
 529
 530 /**
 531  * iwl_legacy_clear_ucode_stations - clear ucode station table bits
 532  *
 533  * This function clears all the bits in the driver indicating
 534  * which stations are active in the ucode. Call when something
 535  * other than explicit station management would cause this in
 536  * the ucode, e.g. unassociated RXON.
 537  */
 538 void iwl_legacy_clear_ucode_stations(struct iwl_priv *priv,
 539                               struct iwl_rxon_context *ctx)
 540 {
 541         int i;
 542         unsigned long flags_spin;
 543         bool cleared = false;
 544
 545         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 546
 547         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 548         for (i = 0; i < priv->hw_params.max_stations; i++) {
 549                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 550                         continue;
 551
 552                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 553                         IWL_DEBUG_INFO(priv,
 554                                 "Clearing ucode active for station %d\n", i);
 555                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 556                         cleared = true;
 557                 }
 558         }
 559         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 560
 561         if (!cleared)
 562                 IWL_DEBUG_INFO(priv,
 563                         "No active stations found to be cleared\n");
 564 }
 565 EXPORT_SYMBOL(iwl_legacy_clear_ucode_stations);
 566
 567 /**
 568  * iwl_legacy_restore_stations() - Restore driver known stations to device
 569  *
 570  * All stations considered active by driver, but not present in ucode, is
 571  * restored.
 572  *
 573  * Function sleeps.
 574  */
 575 void
 576 iwl_legacy_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 577 {
 578         struct iwl_legacy_addsta_cmd sta_cmd;
 579         struct iwl_link_quality_cmd lq;
 580         unsigned long flags_spin;
 581         int i;
 582         bool found = false;
 583         int ret;
 584         bool send_lq;
 585
 586         if (!iwl_legacy_is_ready(priv)) {
 587                 IWL_DEBUG_INFO(priv,
 588                         "Not ready yet, not restoring any stations.\n");
 589                 return;
 590         }
 591
 592         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 593         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 594         for (i = 0; i < priv->hw_params.max_stations; i++) {
 595                 if (ctx->ctxid != priv->stations[i].ctxid)
 596                         continue;
 597                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 598                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 599                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 600                                         priv->stations[i].sta.sta.addr);
 601                         priv->stations[i].sta.mode = 0;
 602                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 603                         found = true;
 604                 }
 605         }
 606
 607         for (i = 0; i < priv->hw_params.max_stations; i++) {
 608                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 609                         memcpy(&sta_cmd, &priv->stations[i].sta,
 610                                sizeof(struct iwl_legacy_addsta_cmd));
 611                         send_lq = false;
 612                         if (priv->stations[i].lq) {
 613                                 memcpy(&lq, priv->stations[i].lq,
 614                                        sizeof(struct iwl_link_quality_cmd));
 615                                 send_lq = true;
 616                         }
 617                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 618                         ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 619                         if (ret) {
 620                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 621                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 622                                         priv->stations[i].sta.sta.addr);
 623                                 priv->stations[i].used &=
 624                                                 ~IWL_STA_DRIVER_ACTIVE;
 625                                 priv->stations[i].used &=
 626                                                 ~IWL_STA_UCODE_INPROGRESS;
 627                                 spin_unlock_irqrestore(&priv->sta_lock,
 628                                                                 flags_spin);
 629                         }
 630                         /*
 631                          * Rate scaling has already been initialized, send
 632                          * current LQ command
 633                          */
 634                         if (send_lq)
 635                                 iwl_legacy_send_lq_cmd(priv, ctx, &lq,
 636                                                                 CMD_SYNC, true);
 637                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 638                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 639                 }
 640         }
 641
 642         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 643         if (!found)
 644                 IWL_DEBUG_INFO(priv, "Restoring all known stations"
 645                                 " .... no stations to be restored.\n");
 646         else
 647                 IWL_DEBUG_INFO(priv, "Restoring all known stations"
 648                                 " .... complete.\n");
 649 }
 650 EXPORT_SYMBOL(iwl_legacy_restore_stations);
 651
 652 int iwl_legacy_get_free_ucode_key_index(struct iwl_priv *priv)
 653 {
 654         int i;
 655
 656         for (i = 0; i < priv->sta_key_max_num; i++)
 657                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 658                         return i;
 659
 660         return WEP_INVALID_OFFSET;
 661 }
 662 EXPORT_SYMBOL(iwl_legacy_get_free_ucode_key_index);
 663
 664 void iwl_legacy_dealloc_bcast_stations(struct iwl_priv *priv)
 665 {
 666         unsigned long flags;
 667         int i;
 668
 669         spin_lock_irqsave(&priv->sta_lock, flags);
 670         for (i = 0; i < priv->hw_params.max_stations; i++) {
 671                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 672                         continue;
 673
 674                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 675                 priv->num_stations--;
 676                 BUG_ON(priv->num_stations < 0);
 677                 kfree(priv->stations[i].lq);
 678                 priv->stations[i].lq = NULL;
 679         }
 680         spin_unlock_irqrestore(&priv->sta_lock, flags);
 681 }
 682 EXPORT_SYMBOL_GPL(iwl_legacy_dealloc_bcast_stations);
 683
 684 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
 685 static void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
 686                            struct iwl_link_quality_cmd *lq)
 687 {
 688         int i;
 689         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 690         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 691                        lq->general_params.single_stream_ant_msk,
 692                        lq->general_params.dual_stream_ant_msk);
 693
 694         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 695                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 696                                i, lq->rs_table[i].rate_n_flags);
 697 }
 698 #else
 699 static inline void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
 700                                    struct iwl_link_quality_cmd *lq)
 701 {
 702 }
 703 #endif
 704
 705 /**
 706  * iwl_legacy_is_lq_table_valid() - Test one aspect of LQ cmd for validity
 707  *
 708  * It sometimes happens when a HT rate has been in use and we
 709  * loose connectivity with AP then mac80211 will first tell us that the
 710  * current channel is not HT anymore before removing the station. In such a
 711  * scenario the RXON flags will be updated to indicate we are not
 712  * communicating HT anymore, but the LQ command may still contain HT rates.
 713  * Test for this to prevent driver from sending LQ command between the time
 714  * RXON flags are updated and when LQ command is updated.
 715  */
 716 static bool iwl_legacy_is_lq_table_valid(struct iwl_priv *priv,
 717                               struct iwl_rxon_context *ctx,
 718                               struct iwl_link_quality_cmd *lq)
 719 {
 720         int i;
 721
 722         if (ctx->ht.enabled)
 723                 return true;
 724
 725         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 726                        ctx->active.channel);
 727         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 728                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
 729                                                 RATE_MCS_HT_MSK) {
 730                         IWL_DEBUG_INFO(priv,
 731                                        "index %d of LQ expects HT channel\n",
 732                                        i);
 733                         return false;
 734                 }
 735         }
 736         return true;
 737 }
 738
 739 /**
 740  * iwl_legacy_send_lq_cmd() - Send link quality command
 741  * @init: This command is sent as part of station initialization right
 742  *        after station has been added.
 743  *
 744  * The link quality command is sent as the last step of station creation.
 745  * This is the special case in which init is set and we call a callback in
 746  * this case to clear the state indicating that station creation is in
 747  * progress.
 748  */
 749 int iwl_legacy_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 750                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 751 {
 752         int ret = 0;
 753         unsigned long flags_spin;
 754
 755         struct iwl_host_cmd cmd = {
 756                 .id = REPLY_TX_LINK_QUALITY_CMD,
 757                 .len = sizeof(struct iwl_link_quality_cmd),
 758                 .flags = flags,
 759                 .data = lq,
 760         };
 761
 762         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 763                 return -EINVAL;
 764
 765
 766         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 767         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 768                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 769                 return -EINVAL;
 770         }
 771         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 772
 773         iwl_legacy_dump_lq_cmd(priv, lq);
 774         BUG_ON(init && (cmd.flags & CMD_ASYNC));
 775
 776         if (iwl_legacy_is_lq_table_valid(priv, ctx, lq))
 777                 ret = iwl_legacy_send_cmd(priv, &cmd);
 778         else
 779                 ret = -EINVAL;
 780
 781         if (cmd.flags & CMD_ASYNC)
 782                 return ret;
 783
 784         if (init) {
 785                 IWL_DEBUG_INFO(priv, "init LQ command complete,"
 786                                 " clearing sta addition status for sta %d\n",
 787                                lq->sta_id);
 788                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 789                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 790                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 791         }
 792         return ret;
 793 }
 794 EXPORT_SYMBOL(iwl_legacy_send_lq_cmd);
 795
 796 int iwl_legacy_mac_sta_remove(struct ieee80211_hw *hw,
 797                        struct ieee80211_vif *vif,
 798                        struct ieee80211_sta *sta)
 799 {
 800         struct iwl_priv *priv = hw->priv;
 801         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 802         int ret;
 803
 804         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 805                         sta->addr);
 806         mutex_lock(&priv->mutex);
 807         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 808                         sta->addr);
 809         ret = iwl_legacy_remove_station(priv, sta_common->sta_id, sta->addr);
 810         if (ret)
 811                 IWL_ERR(priv, "Error removing station %pM\n",
 812                         sta->addr);
 813         mutex_unlock(&priv->mutex);
 814         return ret;
 815 }
 816 EXPORT_SYMBOL(iwl_legacy_mac_sta_remove);