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->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                                     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_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, "Adding station %d failed, no block ack resource.\n",
  92                         sta_id);
  93                 break;
  94         case ADD_STA_MODIFY_NON_EXIST_STA:
  95                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  96                         sta_id);
  97                 break;
  98         default:
  99                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
 100                                 pkt->u.add_sta.status);
 101                 break;
 102         }
 103
 104         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 105                        priv->stations[sta_id].sta.mode ==
 106                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 107                        sta_id, priv->stations[sta_id].sta.sta.addr);
 108
 109         /*
 110          * XXX: The MAC address in the command buffer is often changed from
 111          * the original sent to the device. That is, the MAC address
 112          * written to the command buffer often is not the same MAC address
 113          * read from the command buffer when the command returns. This
 114          * issue has not yet been resolved and this debugging is left to
 115          * observe the problem.
 116          */
 117         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 118                        priv->stations[sta_id].sta.mode ==
 119                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 120                        addsta->sta.addr);
 121         spin_unlock_irqrestore(&priv->sta_lock, flags);
 122
 123         return ret;
 124 }
 125
 126 static void iwl_add_sta_callback(struct iwl_priv *priv,
 127                                  struct iwl_device_cmd *cmd,
 128                                  struct iwl_rx_packet *pkt)
 129 {
 130         struct iwl_addsta_cmd *addsta =
 131                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 132
 133         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 134
 135 }
 136
 137 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 138 {
 139         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 140         struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 141         memcpy(addsta, cmd, size);
 142         /* resrved in 5000 */
 143         addsta->rate_n_flags = cpu_to_le16(0);
 144         return size;
 145 }
 146
 147 int iwl_send_add_sta(struct iwl_priv *priv,
 148                      struct iwl_addsta_cmd *sta, u8 flags)
 149 {
 150         struct iwl_rx_packet *pkt = NULL;
 151         int ret = 0;
 152         u8 data[sizeof(*sta)];
 153         struct iwl_host_cmd cmd = {
 154                 .id = REPLY_ADD_STA,
 155                 .flags = flags,
 156                 .data = { data, },
 157         };
 158         u8 sta_id __maybe_unused = sta->sta.sta_id;
 159
 160         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 161                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 162
 163         if (flags & CMD_ASYNC)
 164                 cmd.callback = iwl_add_sta_callback;
 165         else {
 166                 cmd.flags |= CMD_WANT_SKB;
 167                 might_sleep();
 168         }
 169
 170         cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
 171         ret = trans_send_cmd(&priv->trans, &cmd);
 172
 173         if (ret || (flags & CMD_ASYNC))
 174                 return ret;
 175
 176         if (ret == 0) {
 177                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 178                 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
 179         }
 180         iwl_free_pages(priv, cmd.reply_page);
 181
 182         return ret;
 183 }
 184
 185 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 186                                    struct ieee80211_sta *sta,
 187                                    struct iwl_rxon_context *ctx)
 188 {
 189         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 190         __le32 sta_flags;
 191         u8 mimo_ps_mode;
 192
 193         if (!sta || !sta_ht_inf->ht_supported)
 194                 goto done;
 195
 196         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 197         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 198                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 199                         "static" :
 200                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 201                         "dynamic" : "disabled");
 202
 203         sta_flags = priv->stations[index].sta.station_flags;
 204
 205         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 206
 207         switch (mimo_ps_mode) {
 208         case WLAN_HT_CAP_SM_PS_STATIC:
 209                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 210                 break;
 211         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 212                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 213                 break;
 214         case WLAN_HT_CAP_SM_PS_DISABLED:
 215                 break;
 216         default:
 217                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 218                 break;
 219         }
 220
 221         sta_flags |= cpu_to_le32(
 222               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 223
 224         sta_flags |= cpu_to_le32(
 225               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 226
 227         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 228                 sta_flags |= STA_FLG_HT40_EN_MSK;
 229         else
 230                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 231
 232         priv->stations[index].sta.station_flags = sta_flags;
 233  done:
 234         return;
 235 }
 236
 237 /**
 238  * iwl_prep_station - Prepare station information for addition
 239  *
 240  * should be called with sta_lock held
 241  */
 242 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 243                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 244 {
 245         struct iwl_station_entry *station;
 246         int i;
 247         u8 sta_id = IWL_INVALID_STATION;
 248
 249         if (is_ap)
 250                 sta_id = ctx->ap_sta_id;
 251         else if (is_broadcast_ether_addr(addr))
 252                 sta_id = ctx->bcast_sta_id;
 253         else
 254                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 255                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 256                                                 addr)) {
 257                                 sta_id = i;
 258                                 break;
 259                         }
 260
 261                         if (!priv->stations[i].used &&
 262                             sta_id == IWL_INVALID_STATION)
 263                                 sta_id = i;
 264                 }
 265
 266         /*
 267          * These two conditions have the same outcome, but keep them
 268          * separate
 269          */
 270         if (unlikely(sta_id == IWL_INVALID_STATION))
 271                 return sta_id;
 272
 273         /*
 274          * uCode is not able to deal with multiple requests to add a
 275          * station. Keep track if one is in progress so that we do not send
 276          * another.
 277          */
 278         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 279                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 280                                 sta_id);
 281                 return sta_id;
 282         }
 283
 284         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 285             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 286             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 287                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 288                                 sta_id, addr);
 289                 return sta_id;
 290         }
 291
 292         station = &priv->stations[sta_id];
 293         station->used = IWL_STA_DRIVER_ACTIVE;
 294         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 295                         sta_id, addr);
 296         priv->num_stations++;
 297
 298         /* Set up the REPLY_ADD_STA command to send to device */
 299         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 300         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 301         station->sta.mode = 0;
 302         station->sta.sta.sta_id = sta_id;
 303         station->sta.station_flags = ctx->station_flags;
 304         station->ctxid = ctx->ctxid;
 305
 306         if (sta) {
 307                 struct iwl_station_priv_common *sta_priv;
 308
 309                 sta_priv = (void *)sta->drv_priv;
 310                 sta_priv->ctx = ctx;
 311         }
 312
 313         /*
 314          * OK to call unconditionally, since local stations (IBSS BSSID
 315          * STA and broadcast STA) pass in a NULL sta, and mac80211
 316          * doesn't allow HT IBSS.
 317          */
 318         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 319
 320         return sta_id;
 321
 322 }
 323
 324 #define STA_WAIT_TIMEOUT (HZ/2)
 325
 326 /**
 327  * iwl_add_station_common -
 328  */
 329 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 330                            const u8 *addr, bool is_ap,
 331                            struct ieee80211_sta *sta, u8 *sta_id_r)
 332 {
 333         unsigned long flags_spin;
 334         int ret = 0;
 335         u8 sta_id;
 336         struct iwl_addsta_cmd sta_cmd;
 337
 338         *sta_id_r = 0;
 339         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 340         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 341         if (sta_id == IWL_INVALID_STATION) {
 342                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 343                         addr);
 344                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 345                 return -EINVAL;
 346         }
 347
 348         /*
 349          * uCode is not able to deal with multiple requests to add a
 350          * station. Keep track if one is in progress so that we do not send
 351          * another.
 352          */
 353         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 354                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 355                                sta_id);
 356                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 357                 return -EEXIST;
 358         }
 359
 360         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 361             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 362                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 363                                 sta_id, addr);
 364                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 365                 return -EEXIST;
 366         }
 367
 368         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 369         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 370         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 371
 372         /* Add station to device's station table */
 373         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 374         if (ret) {
 375                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 376                 IWL_ERR(priv, "Adding station %pM failed.\n",
 377                         priv->stations[sta_id].sta.sta.addr);
 378                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 379                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 380                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 381         }
 382         *sta_id_r = sta_id;
 383         return ret;
 384 }
 385
 386 /**
 387  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 388  *
 389  * priv->sta_lock must be held
 390  */
 391 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 392 {
 393         /* Ucode must be active and driver must be non active */
 394         if ((priv->stations[sta_id].used &
 395              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 396                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 397
 398         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 399
 400         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 401         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 402 }
 403
 404 static int iwl_send_remove_station(struct iwl_priv *priv,
 405                                    const u8 *addr, int sta_id,
 406                                    bool temporary)
 407 {
 408         struct iwl_rx_packet *pkt;
 409         int ret;
 410
 411         unsigned long flags_spin;
 412         struct iwl_rem_sta_cmd rm_sta_cmd;
 413
 414         struct iwl_host_cmd cmd = {
 415                 .id = REPLY_REMOVE_STA,
 416                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 417                 .flags = CMD_SYNC,
 418                 .data = { &rm_sta_cmd, },
 419         };
 420
 421         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 422         rm_sta_cmd.num_sta = 1;
 423         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 424
 425         cmd.flags |= CMD_WANT_SKB;
 426
 427         ret = trans_send_cmd(&priv->trans, &cmd);
 428
 429         if (ret)
 430                 return ret;
 431
 432         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 433         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 434                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 435                           pkt->hdr.flags);
 436                 ret = -EIO;
 437         }
 438
 439         if (!ret) {
 440                 switch (pkt->u.rem_sta.status) {
 441                 case REM_STA_SUCCESS_MSK:
 442                         if (!temporary) {
 443                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 444                                 iwl_sta_ucode_deactivate(priv, sta_id);
 445                                 spin_unlock_irqrestore(&priv->sta_lock, 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, 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)) {
 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->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->sta_lock, flags);
 513
 514         return iwl_send_remove_station(priv, addr, sta_id, false);
 515 out_err:
 516         spin_unlock_irqrestore(&priv->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->sta_lock, flags_spin);
 538         for (i = 0; i < priv->hw_params.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->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)) {
 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->sta_lock, flags_spin);
 579         for (i = 0; i < priv->hw_params.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 < priv->hw_params.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                                 memcpy(&lq, priv->stations[i].lq,
 599                                        sizeof(struct iwl_link_quality_cmd));
 600                                 send_lq = true;
 601                         }
 602                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 603                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 604                         if (ret) {
 605                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 606                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 607                                         priv->stations[i].sta.sta.addr);
 608                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 609                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 610                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 611                         }
 612                         /*
 613                          * Rate scaling has already been initialized, send
 614                          * current LQ command
 615                          */
 616                         if (send_lq)
 617                                 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 618                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 619                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 620                 }
 621         }
 622
 623         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 624         if (!found)
 625                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 626         else
 627                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 628 }
 629
 630 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 631 {
 632         unsigned long flags;
 633         int sta_id = ctx->ap_sta_id;
 634         int ret;
 635         struct iwl_addsta_cmd sta_cmd;
 636         struct iwl_link_quality_cmd lq;
 637         bool active;
 638
 639         spin_lock_irqsave(&priv->sta_lock, flags);
 640         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 641                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 642                 return;
 643         }
 644
 645         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
 646         sta_cmd.mode = 0;
 647         memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
 648
 649         active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
 650         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 651         spin_unlock_irqrestore(&priv->sta_lock, flags);
 652
 653         if (active) {
 654                 ret = iwl_send_remove_station(
 655                         priv, priv->stations[sta_id].sta.sta.addr,
 656                         sta_id, true);
 657                 if (ret)
 658                         IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
 659                                 priv->stations[sta_id].sta.sta.addr, ret);
 660         }
 661         spin_lock_irqsave(&priv->sta_lock, flags);
 662         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
 663         spin_unlock_irqrestore(&priv->sta_lock, flags);
 664
 665         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 666         if (ret)
 667                 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
 668                         priv->stations[sta_id].sta.sta.addr, ret);
 669         iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
 670 }
 671
 672 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 673 {
 674         int i;
 675
 676         for (i = 0; i < priv->sta_key_max_num; i++)
 677                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 678                         return i;
 679
 680         return WEP_INVALID_OFFSET;
 681 }
 682
 683 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 684 {
 685         unsigned long flags;
 686         int i;
 687
 688         spin_lock_irqsave(&priv->sta_lock, flags);
 689         for (i = 0; i < priv->hw_params.max_stations; i++) {
 690                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 691                         continue;
 692
 693                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 694                 priv->num_stations--;
 695                 if (WARN_ON(priv->num_stations < 0))
 696                         priv->num_stations = 0;
 697                 kfree(priv->stations[i].lq);
 698                 priv->stations[i].lq = NULL;
 699         }
 700         spin_unlock_irqrestore(&priv->sta_lock, flags);
 701 }
 702
 703 #ifdef CONFIG_IWLWIFI_DEBUG
 704 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 705                            struct iwl_link_quality_cmd *lq)
 706 {
 707         int i;
 708         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 709         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 710                        lq->general_params.single_stream_ant_msk,
 711                        lq->general_params.dual_stream_ant_msk);
 712
 713         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 714                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 715                                i, lq->rs_table[i].rate_n_flags);
 716 }
 717 #else
 718 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 719                                    struct iwl_link_quality_cmd *lq)
 720 {
 721 }
 722 #endif
 723
 724 /**
 725  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 726  *
 727  * It sometimes happens when a HT rate has been in use and we
 728  * loose connectivity with AP then mac80211 will first tell us that the
 729  * current channel is not HT anymore before removing the station. In such a
 730  * scenario the RXON flags will be updated to indicate we are not
 731  * communicating HT anymore, but the LQ command may still contain HT rates.
 732  * Test for this to prevent driver from sending LQ command between the time
 733  * RXON flags are updated and when LQ command is updated.
 734  */
 735 static bool is_lq_table_valid(struct iwl_priv *priv,
 736                               struct iwl_rxon_context *ctx,
 737                               struct iwl_link_quality_cmd *lq)
 738 {
 739         int i;
 740
 741         if (ctx->ht.enabled)
 742                 return true;
 743
 744         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 745                        ctx->active.channel);
 746         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 747                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
 748                         IWL_DEBUG_INFO(priv,
 749                                        "index %d of LQ expects HT channel\n",
 750                                        i);
 751                         return false;
 752                 }
 753         }
 754         return true;
 755 }
 756
 757 /**
 758  * iwl_send_lq_cmd() - Send link quality command
 759  * @init: This command is sent as part of station initialization right
 760  *        after station has been added.
 761  *
 762  * The link quality command is sent as the last step of station creation.
 763  * This is the special case in which init is set and we call a callback in
 764  * this case to clear the state indicating that station creation is in
 765  * progress.
 766  */
 767 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 768                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 769 {
 770         int ret = 0;
 771         unsigned long flags_spin;
 772
 773         struct iwl_host_cmd cmd = {
 774                 .id = REPLY_TX_LINK_QUALITY_CMD,
 775                 .len = { sizeof(struct iwl_link_quality_cmd), },
 776                 .flags = flags,
 777                 .data = { lq, },
 778         };
 779
 780         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 781                 return -EINVAL;
 782
 783
 784         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 785         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 786                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 787                 return -EINVAL;
 788         }
 789         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 790
 791         iwl_dump_lq_cmd(priv, lq);
 792         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 793                 return -EINVAL;
 794
 795         if (is_lq_table_valid(priv, ctx, lq))
 796                 ret = trans_send_cmd(&priv->trans, &cmd);
 797         else
 798                 ret = -EINVAL;
 799
 800         if (cmd.flags & CMD_ASYNC)
 801                 return ret;
 802
 803         if (init) {
 804                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
 805                                lq->sta_id);
 806                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 807                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 808                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 809         }
 810         return ret;
 811 }
 812
 813 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
 814                        struct ieee80211_vif *vif,
 815                        struct ieee80211_sta *sta)
 816 {
 817         struct iwl_priv *priv = hw->priv;
 818         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 819         int ret;
 820
 821         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 822                         sta->addr);
 823         mutex_lock(&priv->mutex);
 824         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 825                         sta->addr);
 826         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
 827         if (ret)
 828                 IWL_ERR(priv, "Error removing station %pM\n",
 829                         sta->addr);
 830         mutex_unlock(&priv->mutex);
 831         return ret;
 832 }