drivers/net/wireless/iwlwifi/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 #include "iwl-trans.h"
  39 #include "iwl-agn.h"
  40
  41 /* priv->shrd->sta_lock must be held */
  42 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  43 {
  44
  45         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  46                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  47                         sta_id, priv->stations[sta_id].sta.sta.addr);
  48
  49         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  50                 IWL_DEBUG_ASSOC(priv,
  51                                 "STA id %u addr %pM already present 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_process_add_sta_resp(struct iwl_priv *priv,
  61                                     struct iwl_addsta_cmd *addsta,
  62                                     struct iwl_rx_packet *pkt)
  63 {
  64         u8 sta_id = addsta->sta.sta_id;
  65         unsigned long flags;
  66         int ret = -EIO;
  67
  68         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  69                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  70                         pkt->hdr.flags);
  71                 return ret;
  72         }
  73
  74         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  75                        sta_id);
  76
  77         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
  78
  79         switch (pkt->u.add_sta.status) {
  80         case ADD_STA_SUCCESS_MSK:
  81                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  82                 iwl_sta_ucode_activate(priv, sta_id);
  83                 ret = 0;
  84                 break;
  85         case ADD_STA_NO_ROOM_IN_TABLE:
  86                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  87                         sta_id);
  88                 break;
  89         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  90                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  91                         sta_id);
  92                 break;
  93         case ADD_STA_MODIFY_NON_EXIST_STA:
  94                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  95                         sta_id);
  96                 break;
  97         default:
  98                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  99                                 pkt->u.add_sta.status);
 100                 break;
 101         }
 102
 103         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 104                        priv->stations[sta_id].sta.mode ==
 105                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 106                        sta_id, priv->stations[sta_id].sta.sta.addr);
 107
 108         /*
 109          * XXX: The MAC address in the command buffer is often changed from
 110          * the original sent to the device. That is, the MAC address
 111          * written to the command buffer often is not the same MAC address
 112          * read from the command buffer when the command returns. This
 113          * issue has not yet been resolved and this debugging is left to
 114          * observe the problem.
 115          */
 116         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 117                        priv->stations[sta_id].sta.mode ==
 118                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 119                        addsta->sta.addr);
 120         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 121
 122         return ret;
 123 }
 124
 125 int iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 126                                struct iwl_device_cmd *cmd)
 127 {
 128         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 129         struct iwl_addsta_cmd *addsta =
 130                 (struct iwl_addsta_cmd *) cmd->payload;
 131
 132         return iwl_process_add_sta_resp(priv, addsta, pkt);
 133 }
 134
 135 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 136 {
 137         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 138         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 139         memcpy(addsta, cmd, size);
 140         /* resrved in 5000 */
 141         addsta->rate_n_flags = cpu_to_le16(0);
 142         return size;
 143 }
 144
 145 int iwl_send_add_sta(struct iwl_priv *priv,
 146                      struct iwl_addsta_cmd *sta, u8 flags)
 147 {
 148         int ret = 0;
 149         u8 data[sizeof(*sta)];
 150         struct iwl_host_cmd cmd = {
 151                 .id = REPLY_ADD_STA,
 152                 .flags = flags,
 153                 .data = { data, },
 154         };
 155         u8 sta_id __maybe_unused = sta->sta.sta_id;
 156
 157         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 158                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 159
 160         if (!(flags & CMD_ASYNC)) {
 161                 cmd.flags |= CMD_WANT_SKB;
 162                 might_sleep();
 163         }
 164
 165         cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
 166         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 167
 168         if (ret || (flags & CMD_ASYNC))
 169                 return ret;
 170         /*else the command was successfully sent in SYNC mode, need to free
 171          * the reply page */
 172
 173         iwl_free_pages(priv->shrd, cmd.reply_page);
 174
 175         if (cmd.handler_status)
 176                 IWL_ERR(priv, "%s - error in the CMD response %d", __func__,
 177                         cmd.handler_status);
 178
 179         return cmd.handler_status;
 180 }
 181
 182 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 183                                    struct ieee80211_sta *sta,
 184                                    struct iwl_rxon_context *ctx)
 185 {
 186         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 187         __le32 sta_flags;
 188         u8 mimo_ps_mode;
 189
 190         if (!sta || !sta_ht_inf->ht_supported)
 191                 goto done;
 192
 193         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 194         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 195                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 196                         "static" :
 197                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 198                         "dynamic" : "disabled");
 199
 200         sta_flags = priv->stations[index].sta.station_flags;
 201
 202         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 203
 204         switch (mimo_ps_mode) {
 205         case WLAN_HT_CAP_SM_PS_STATIC:
 206                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 207                 break;
 208         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 209                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 210                 break;
 211         case WLAN_HT_CAP_SM_PS_DISABLED:
 212                 break;
 213         default:
 214                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 215                 break;
 216         }
 217
 218         sta_flags |= cpu_to_le32(
 219               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 220
 221         sta_flags |= cpu_to_le32(
 222               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 223
 224         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 225                 sta_flags |= STA_FLG_HT40_EN_MSK;
 226         else
 227                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 228
 229         priv->stations[index].sta.station_flags = sta_flags;
 230  done:
 231         return;
 232 }
 233
 234 /**
 235  * iwl_prep_station - Prepare station information for addition
 236  *
 237  * should be called with sta_lock held
 238  */
 239 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 240                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 241 {
 242         struct iwl_station_entry *station;
 243         int i;
 244         u8 sta_id = IWL_INVALID_STATION;
 245
 246         if (is_ap)
 247                 sta_id = ctx->ap_sta_id;
 248         else if (is_broadcast_ether_addr(addr))
 249                 sta_id = ctx->bcast_sta_id;
 250         else
 251                 for (i = IWL_STA_ID;
 252                      i < hw_params(priv).max_stations; i++) {
 253                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 254                                                 addr)) {
 255                                 sta_id = i;
 256                                 break;
 257                         }
 258
 259                         if (!priv->stations[i].used &&
 260                             sta_id == IWL_INVALID_STATION)
 261                                 sta_id = i;
 262                 }
 263
 264         /*
 265          * These two conditions have the same outcome, but keep them
 266          * separate
 267          */
 268         if (unlikely(sta_id == IWL_INVALID_STATION))
 269                 return sta_id;
 270
 271         /*
 272          * uCode is not able to deal with multiple requests to add a
 273          * station. Keep track if one is in progress so that we do not send
 274          * another.
 275          */
 276         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 277                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 278                                 sta_id);
 279                 return sta_id;
 280         }
 281
 282         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 283             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 284             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 285                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 286                                 sta_id, addr);
 287                 return sta_id;
 288         }
 289
 290         station = &priv->stations[sta_id];
 291         station->used = IWL_STA_DRIVER_ACTIVE;
 292         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 293                         sta_id, addr);
 294         priv->num_stations++;
 295
 296         /* Set up the REPLY_ADD_STA command to send to device */
 297         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 298         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 299         station->sta.mode = 0;
 300         station->sta.sta.sta_id = sta_id;
 301         station->sta.station_flags = ctx->station_flags;
 302         station->ctxid = ctx->ctxid;
 303
 304         if (sta) {
 305                 struct iwl_station_priv *sta_priv;
 306
 307                 sta_priv = (void *)sta->drv_priv;
 308                 sta_priv->ctx = ctx;
 309         }
 310
 311         /*
 312          * OK to call unconditionally, since local stations (IBSS BSSID
 313          * STA and broadcast STA) pass in a NULL sta, and mac80211
 314          * doesn't allow HT IBSS.
 315          */
 316         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 317
 318         return sta_id;
 319
 320 }
 321
 322 #define STA_WAIT_TIMEOUT (HZ/2)
 323
 324 /**
 325  * iwl_add_station_common -
 326  */
 327 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 328                            const u8 *addr, bool is_ap,
 329                            struct ieee80211_sta *sta, u8 *sta_id_r)
 330 {
 331         unsigned long flags_spin;
 332         int ret = 0;
 333         u8 sta_id;
 334         struct iwl_addsta_cmd sta_cmd;
 335
 336         *sta_id_r = 0;
 337         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 338         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 339         if (sta_id == IWL_INVALID_STATION) {
 340                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 341                         addr);
 342                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 343                 return -EINVAL;
 344         }
 345
 346         /*
 347          * uCode is not able to deal with multiple requests to add a
 348          * station. Keep track if one is in progress so that we do not send
 349          * another.
 350          */
 351         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 352                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 353                                sta_id);
 354                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 355                 return -EEXIST;
 356         }
 357
 358         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 359             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 360                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 361                                 sta_id, addr);
 362                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 363                 return -EEXIST;
 364         }
 365
 366         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 367         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 368         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 369
 370         /* Add station to device's station table */
 371         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 372         if (ret) {
 373                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 374                 IWL_ERR(priv, "Adding station %pM failed.\n",
 375                         priv->stations[sta_id].sta.sta.addr);
 376                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 377                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 378                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 379         }
 380         *sta_id_r = sta_id;
 381         return ret;
 382 }
 383
 384 /**
 385  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 386  *
 387  * priv->shrd->sta_lock must be held
 388  */
 389 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 390 {
 391         /* Ucode must be active and driver must be non active */
 392         if ((priv->stations[sta_id].used &
 393              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 394                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 395
 396         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 397
 398         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 399         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 400 }
 401
 402 static int iwl_send_remove_station(struct iwl_priv *priv,
 403                                    const u8 *addr, int sta_id,
 404                                    bool temporary)
 405 {
 406         struct iwl_rx_packet *pkt;
 407         int ret;
 408
 409         unsigned long flags_spin;
 410         struct iwl_rem_sta_cmd rm_sta_cmd;
 411
 412         struct iwl_host_cmd cmd = {
 413                 .id = REPLY_REMOVE_STA,
 414                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 415                 .flags = CMD_SYNC,
 416                 .data = { &rm_sta_cmd, },
 417         };
 418
 419         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 420         rm_sta_cmd.num_sta = 1;
 421         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 422
 423         cmd.flags |= CMD_WANT_SKB;
 424
 425         ret = iwl_trans_send_cmd(trans(priv), &cmd);
 426
 427         if (ret)
 428                 return ret;
 429
 430         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 431         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 432                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 433                           pkt->hdr.flags);
 434                 ret = -EIO;
 435         }
 436
 437         if (!ret) {
 438                 switch (pkt->u.rem_sta.status) {
 439                 case REM_STA_SUCCESS_MSK:
 440                         if (!temporary) {
 441                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 442                                         flags_spin);
 443                                 iwl_sta_ucode_deactivate(priv, sta_id);
 444                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 445                                         flags_spin);
 446                         }
 447                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 448                         break;
 449                 default:
 450                         ret = -EIO;
 451                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 452                         break;
 453                 }
 454         }
 455         iwl_free_pages(priv->shrd, cmd.reply_page);
 456
 457         return ret;
 458 }
 459
 460 /**
 461  * iwl_remove_station - Remove driver's knowledge of station.
 462  */
 463 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 464                        const u8 *addr)
 465 {
 466         unsigned long flags;
 467
 468         if (!iwl_is_ready(priv->shrd)) {
 469                 IWL_DEBUG_INFO(priv,
 470                         "Unable to remove station %pM, device not ready.\n",
 471                         addr);
 472                 /*
 473                  * It is typical for stations to be removed when we are
 474                  * going down. Return success since device will be down
 475                  * soon anyway
 476                  */
 477                 return 0;
 478         }
 479
 480         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 481                         sta_id, addr);
 482
 483         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 484                 return -EINVAL;
 485
 486         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 487
 488         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 489                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 490                                 addr);
 491                 goto out_err;
 492         }
 493
 494         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 495                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 496                                 addr);
 497                 goto out_err;
 498         }
 499
 500         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 501                 kfree(priv->stations[sta_id].lq);
 502                 priv->stations[sta_id].lq = NULL;
 503         }
 504
 505         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 506
 507         priv->num_stations--;
 508
 509         if (WARN_ON(priv->num_stations < 0))
 510                 priv->num_stations = 0;
 511
 512         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 513
 514         return iwl_send_remove_station(priv, addr, sta_id, false);
 515 out_err:
 516         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 517         return -EINVAL;
 518 }
 519
 520 /**
 521  * iwl_clear_ucode_stations - clear ucode station table bits
 522  *
 523  * This function clears all the bits in the driver indicating
 524  * which stations are active in the ucode. Call when something
 525  * other than explicit station management would cause this in
 526  * the ucode, e.g. unassociated RXON.
 527  */
 528 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 529                               struct iwl_rxon_context *ctx)
 530 {
 531         int i;
 532         unsigned long flags_spin;
 533         bool cleared = false;
 534
 535         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 536
 537         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 538         for (i = 0; i < hw_params(priv).max_stations; i++) {
 539                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 540                         continue;
 541
 542                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 543                         IWL_DEBUG_INFO(priv, "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, "No active stations found to be cleared\n");
 552 }
 553
 554 /**
 555  * iwl_restore_stations() - Restore driver known stations to device
 556  *
 557  * All stations considered active by driver, but not present in ucode, is
 558  * restored.
 559  *
 560  * Function sleeps.
 561  */
 562 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 563 {
 564         struct iwl_addsta_cmd sta_cmd;
 565         struct iwl_link_quality_cmd lq;
 566         unsigned long flags_spin;
 567         int i;
 568         bool found = false;
 569         int ret;
 570         bool send_lq;
 571
 572         if (!iwl_is_ready(priv->shrd)) {
 573                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 574                 return;
 575         }
 576
 577         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 578         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 579         for (i = 0; i < hw_params(priv).max_stations; i++) {
 580                 if (ctx->ctxid != priv->stations[i].ctxid)
 581                         continue;
 582                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 583                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 584                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 585                                         priv->stations[i].sta.sta.addr);
 586                         priv->stations[i].sta.mode = 0;
 587                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 588                         found = true;
 589                 }
 590         }
 591
 592         for (i = 0; i < hw_params(priv).max_stations; i++) {
 593                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 594                         memcpy(&sta_cmd, &priv->stations[i].sta,
 595                                sizeof(struct iwl_addsta_cmd));
 596                         send_lq = false;
 597                         if (priv->stations[i].lq) {
 598                                 if (priv->shrd->wowlan)
 599                                         iwl_sta_fill_lq(priv, ctx, i, &lq);
 600                                 else
 601                                         memcpy(&lq, priv->stations[i].lq,
 602                                                sizeof(struct iwl_link_quality_cmd));
 603                                 send_lq = true;
 604                         }
 605                         spin_unlock_irqrestore(&priv->shrd->sta_lock,
 606                                                flags_spin);
 607                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 608                         if (ret) {
 609                                 spin_lock_irqsave(&priv->shrd->sta_lock,
 610                                                   flags_spin);
 611                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 612                                         priv->stations[i].sta.sta.addr);
 613                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 614                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 615                                 spin_unlock_irqrestore(&priv->shrd->sta_lock,
 616                                                        flags_spin);
 617                         }
 618                         /*
 619                          * Rate scaling has already been initialized, send
 620                          * current LQ command
 621                          */
 622                         if (send_lq)
 623                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 624                         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 625                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 626                 }
 627         }
 628
 629         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 630         if (!found)
 631                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 632         else
 633                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 634 }
 635
 636 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 637 {
 638         unsigned long flags;
 639         int sta_id = ctx->ap_sta_id;
 640         int ret;
 641         struct iwl_addsta_cmd sta_cmd;
 642         struct iwl_link_quality_cmd lq;
 643         bool active;
 644
 645         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 646         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 647                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 648                 return;
 649         }
 650
 651         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 652         sta_cmd.mode = 0;
 653         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 654
 655         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 656         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 657         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 658
 659         if (active) {
 660                 ret = iwl_send_remove_station(
 661                         priv, priv->stations[sta_id].sta.sta.addr,
 662                         sta_id, true);
 663                 if (ret)
 664                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 665                                 priv->stations[sta_id].sta.sta.addr, ret);
 666         }
 667         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 668         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 669         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 670
 671         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 672         if (ret)
 673                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 674                         priv->stations[sta_id].sta.sta.addr, ret);
 675         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 676 }
 677
 678 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 679 {
 680         int i;
 681
 682         for (i = 0; i < priv->sta_key_max_num; i++)
 683                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 684                         return i;
 685
 686         return WEP_INVALID_OFFSET;
 687 }
 688
 689 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 690 {
 691         unsigned long flags;
 692         int i;
 693
 694         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 695         for (i = 0; i < hw_params(priv).max_stations; i++) {
 696                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 697                         continue;
 698
 699                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 700                 priv->num_stations--;
 701                 if (WARN_ON(priv->num_stations < 0))
 702                         priv->num_stations = 0;
 703                 kfree(priv->stations[i].lq);
 704                 priv->stations[i].lq = NULL;
 705         }
 706         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 707 }
 708
 709 #ifdef CONFIG_IWLWIFI_DEBUG
 710 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 711                            struct iwl_link_quality_cmd *lq)
 712 {
 713         int i;
 714         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 715         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 716                        lq->general_params.single_stream_ant_msk,
 717                        lq->general_params.dual_stream_ant_msk);
 718
 719         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 720                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 721                                i, lq->rs_table[i].rate_n_flags);
 722 }
 723 #else
 724 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 725                                    struct iwl_link_quality_cmd *lq)
 726 {
 727 }
 728 #endif
 729
 730 /**
 731  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 732  *
 733  * It sometimes happens when a HT rate has been in use and we
 734  * loose connectivity with AP then mac80211 will first tell us that the
 735  * current channel is not HT anymore before removing the station. In such a
 736  * scenario the RXON flags will be updated to indicate we are not
 737  * communicating HT anymore, but the LQ command may still contain HT rates.
 738  * Test for this to prevent driver from sending LQ command between the time
 739  * RXON flags are updated and when LQ command is updated.
 740  */
 741 static bool is_lq_table_valid(struct iwl_priv *priv,
 742                               struct iwl_rxon_context *ctx,
 743                               struct iwl_link_quality_cmd *lq)
 744 {
 745         int i;
 746
 747         if (ctx->ht.enabled)
 748                 return true;
 749
 750         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 751                        ctx->active.channel);
 752         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 753                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 754                         IWL_DEBUG_INFO(priv,
 755                                        "index %d of LQ expects HT channel\n",
 756                                        i);
 757                         return false;
 758                 }
 759         }
 760         return true;
 761 }
 762
 763 /**
 764  * iwl_send_lq_cmd() - Send link quality command
 765  * @init: This command is sent as part of station initialization right
 766  *        after station has been added.
 767  *
 768  * The link quality command is sent as the last step of station creation.
 769  * This is the special case in which init is set and we call a callback in
 770  * this case to clear the state indicating that station creation is in
 771  * progress.
 772  */
 773 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 774                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 775 {
 776         int ret = 0;
 777         unsigned long flags_spin;
 778
 779         struct iwl_host_cmd cmd = {
 780                 .id = REPLY_TX_LINK_QUALITY_CMD,
 781                 .len = { sizeof(struct iwl_link_quality_cmd), },
 782                 .flags = flags,
 783                 .data = { lq, },
 784         };
 785
 786         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 787                 return -EINVAL;
 788
 789
 790         spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 791         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 792                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 793                 return -EINVAL;
 794         }
 795         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 796
 797         iwl_dump_lq_cmd(priv, lq);
 798         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 799                 return -EINVAL;
 800
 801         if (is_lq_table_valid(priv, ctx, lq))
 802                 ret = iwl_trans_send_cmd(trans(priv), &cmd);
 803         else
 804                 ret = -EINVAL;
 805
 806         if (cmd.flags & CMD_ASYNC)
 807                 return ret;
 808
 809         if (init) {
 810                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 811                                lq->sta_id);
 812                 spin_lock_irqsave(&priv->shrd->sta_lock, flags_spin);
 813                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 814                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags_spin);
 815         }
 816         return ret;
 817 }
 818
 819 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 820                        struct ieee80211_vif *vif,
 821                        struct ieee80211_sta *sta)
 822 {
 823         struct iwl_priv *priv = hw->priv;
 824         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 825         int ret;
 826
 827         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 828                         sta->addr);
 829         mutex_lock(&priv->shrd->mutex);
 830         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 831                         sta->addr);
 832         ret = iwl_remove_station(priv, sta_priv->sta_id, sta->addr);
 833         if (ret)
 834                 IWL_ERR(priv, "Error removing station %pM\n",
 835                         sta->addr);
 836         mutex_unlock(&priv->shrd->mutex);
 837         return ret;
 838 }