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 #include <linux/export.h>
  35
  36 #include "iwl-dev.h"
  37 #include "iwl-core.h"
  38 #include "iwl-sta.h"
  39
  40 /* il->sta_lock must be held */
  41 static void il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
  42 {
  43
  44         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
  45                 IL_ERR(
  46                         "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  47                         sta_id, il->stations[sta_id].sta.sta.addr);
  48
  49         if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
  50                 D_ASSOC(
  51                         "STA id %u addr %pM already present"
  52                         " in uCode (according to driver)\n",
  53                         sta_id, il->stations[sta_id].sta.sta.addr);
  54         } else {
  55                 il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
  56                 D_ASSOC("Added STA id %u addr %pM to uCode\n",
  57                                 sta_id, il->stations[sta_id].sta.sta.addr);
  58         }
  59 }
  60
  61 static int il_process_add_sta_resp(struct il_priv *il,
  62                                     struct il_addsta_cmd *addsta,
  63                                     struct il_rx_pkt *pkt,
  64                                     bool sync)
  65 {
  66         u8 sta_id = addsta->sta.sta_id;
  67         unsigned long flags;
  68         int ret = -EIO;
  69
  70         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
  71                 IL_ERR("Bad return from C_ADD_STA (0x%08X)\n",
  72                         pkt->hdr.flags);
  73                 return ret;
  74         }
  75
  76         D_INFO("Processing response for adding station %u\n",
  77                        sta_id);
  78
  79         spin_lock_irqsave(&il->sta_lock, flags);
  80
  81         switch (pkt->u.add_sta.status) {
  82         case ADD_STA_SUCCESS_MSK:
  83                 D_INFO("C_ADD_STA PASSED\n");
  84                 il_sta_ucode_activate(il, sta_id);
  85                 ret = 0;
  86                 break;
  87         case ADD_STA_NO_ROOM_IN_TBL:
  88                 IL_ERR("Adding station %d failed, no room in table.\n",
  89                         sta_id);
  90                 break;
  91         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  92                 IL_ERR(
  93                         "Adding station %d failed, no block ack resource.\n",
  94                         sta_id);
  95                 break;
  96         case ADD_STA_MODIFY_NON_EXIST_STA:
  97                 IL_ERR("Attempting to modify non-existing station %d\n",
  98                         sta_id);
  99                 break;
 100         default:
 101                 D_ASSOC("Received C_ADD_STA:(0x%08X)\n",
 102                                 pkt->u.add_sta.status);
 103                 break;
 104         }
 105
 106         D_INFO("%s station id %u addr %pM\n",
 107                        il->stations[sta_id].sta.mode ==
 108                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 109                        sta_id, il->stations[sta_id].sta.sta.addr);
 110
 111         /*
 112          * XXX: The MAC address in the command buffer is often changed from
 113          * the original sent to the device. That is, the MAC address
 114          * written to the command buffer often is not the same MAC address
 115          * read from the command buffer when the command returns. This
 116          * issue has not yet been resolved and this debugging is left to
 117          * observe the problem.
 118          */
 119         D_INFO("%s station according to cmd buffer %pM\n",
 120                        il->stations[sta_id].sta.mode ==
 121                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 122                        addsta->sta.addr);
 123         spin_unlock_irqrestore(&il->sta_lock, flags);
 124
 125         return ret;
 126 }
 127
 128 static void il_add_sta_callback(struct il_priv *il,
 129                                  struct il_device_cmd *cmd,
 130                                  struct il_rx_pkt *pkt)
 131 {
 132         struct il_addsta_cmd *addsta =
 133                 (struct il_addsta_cmd *)cmd->cmd.payload;
 134
 135         il_process_add_sta_resp(il, addsta, pkt, false);
 136
 137 }
 138
 139 int il_send_add_sta(struct il_priv *il,
 140                      struct il_addsta_cmd *sta, u8 flags)
 141 {
 142         struct il_rx_pkt *pkt = NULL;
 143         int ret = 0;
 144         u8 data[sizeof(*sta)];
 145         struct il_host_cmd cmd = {
 146                 .id = C_ADD_STA,
 147                 .flags = flags,
 148                 .data = data,
 149         };
 150         u8 sta_id __maybe_unused = sta->sta.sta_id;
 151
 152         D_INFO("Adding sta %u (%pM) %ssynchronously\n",
 153                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 154
 155         if (flags & CMD_ASYNC)
 156                 cmd.callback = il_add_sta_callback;
 157         else {
 158                 cmd.flags |= CMD_WANT_SKB;
 159                 might_sleep();
 160         }
 161
 162         cmd.len = il->cfg->ops->utils->build_addsta_hcmd(sta, data);
 163         ret = il_send_cmd(il, &cmd);
 164
 165         if (ret || (flags & CMD_ASYNC))
 166                 return ret;
 167
 168         if (ret == 0) {
 169                 pkt = (struct il_rx_pkt *)cmd.reply_page;
 170                 ret = il_process_add_sta_resp(il, sta, pkt, true);
 171         }
 172         il_free_pages(il, cmd.reply_page);
 173
 174         return ret;
 175 }
 176 EXPORT_SYMBOL(il_send_add_sta);
 177
 178 static void il_set_ht_add_station(struct il_priv *il, u8 idx,
 179                                    struct ieee80211_sta *sta,
 180                                    struct il_rxon_context *ctx)
 181 {
 182         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 183         __le32 sta_flags;
 184         u8 mimo_ps_mode;
 185
 186         if (!sta || !sta_ht_inf->ht_supported)
 187                 goto done;
 188
 189         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 190         D_ASSOC("spatial multiplexing power save mode: %s\n",
 191                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 192                         "static" :
 193                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 194                         "dynamic" : "disabled");
 195
 196         sta_flags = il->stations[idx].sta.station_flags;
 197
 198         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 199
 200         switch (mimo_ps_mode) {
 201         case WLAN_HT_CAP_SM_PS_STATIC:
 202                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 203                 break;
 204         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 205                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 206                 break;
 207         case WLAN_HT_CAP_SM_PS_DISABLED:
 208                 break;
 209         default:
 210                 IL_WARN("Invalid MIMO PS mode %d\n", mimo_ps_mode);
 211                 break;
 212         }
 213
 214         sta_flags |= cpu_to_le32(
 215               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 216
 217         sta_flags |= cpu_to_le32(
 218               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 219
 220         if (il_is_ht40_tx_allowed(il, ctx, &sta->ht_cap))
 221                 sta_flags |= STA_FLG_HT40_EN_MSK;
 222         else
 223                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 224
 225         il->stations[idx].sta.station_flags = sta_flags;
 226  done:
 227         return;
 228 }
 229
 230 /**
 231  * il_prep_station - Prepare station information for addition
 232  *
 233  * should be called with sta_lock held
 234  */
 235 u8 il_prep_station(struct il_priv *il, struct il_rxon_context *ctx,
 236                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 237 {
 238         struct il_station_entry *station;
 239         int i;
 240         u8 sta_id = IL_INVALID_STATION;
 241         u16 rate;
 242
 243         if (is_ap)
 244                 sta_id = ctx->ap_sta_id;
 245         else if (is_broadcast_ether_addr(addr))
 246                 sta_id = ctx->bcast_sta_id;
 247         else
 248                 for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
 249                         if (!compare_ether_addr(il->stations[i].sta.sta.addr,
 250                                                 addr)) {
 251                                 sta_id = i;
 252                                 break;
 253                         }
 254
 255                         if (!il->stations[i].used &&
 256                             sta_id == IL_INVALID_STATION)
 257                                 sta_id = i;
 258                 }
 259
 260         /*
 261          * These two conditions have the same outcome, but keep them
 262          * separate
 263          */
 264         if (unlikely(sta_id == IL_INVALID_STATION))
 265                 return sta_id;
 266
 267         /*
 268          * uCode is not able to deal with multiple requests to add a
 269          * station. Keep track if one is in progress so that we do not send
 270          * another.
 271          */
 272         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
 273                 D_INFO(
 274                                 "STA %d already in process of being added.\n",
 275                                 sta_id);
 276                 return sta_id;
 277         }
 278
 279         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
 280             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
 281             !compare_ether_addr(il->stations[sta_id].sta.sta.addr, addr)) {
 282                 D_ASSOC(
 283                                 "STA %d (%pM) already added, not adding again.\n",
 284                                 sta_id, addr);
 285                 return sta_id;
 286         }
 287
 288         station = &il->stations[sta_id];
 289         station->used = IL_STA_DRIVER_ACTIVE;
 290         D_ASSOC("Add STA to driver ID %d: %pM\n",
 291                         sta_id, addr);
 292         il->num_stations++;
 293
 294         /* Set up the C_ADD_STA command to send to device */
 295         memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
 296         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 297         station->sta.mode = 0;
 298         station->sta.sta.sta_id = sta_id;
 299         station->sta.station_flags = ctx->station_flags;
 300         station->ctxid = ctx->ctxid;
 301
 302         if (sta) {
 303                 struct il_station_priv_common *sta_priv;
 304
 305                 sta_priv = (void *)sta->drv_priv;
 306                 sta_priv->ctx = ctx;
 307         }
 308
 309         /*
 310          * OK to call unconditionally, since local stations (IBSS BSSID
 311          * STA and broadcast STA) pass in a NULL sta, and mac80211
 312          * doesn't allow HT IBSS.
 313          */
 314         il_set_ht_add_station(il, sta_id, sta, ctx);
 315
 316         /* 3945 only */
 317         rate = (il->band == IEEE80211_BAND_5GHZ) ?
 318                 RATE_6M_PLCP : RATE_1M_PLCP;
 319         /* Turn on both antennas for the station... */
 320         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 321
 322         return sta_id;
 323
 324 }
 325 EXPORT_SYMBOL_GPL(il_prep_station);
 326
 327 #define STA_WAIT_TIMEOUT (HZ/2)
 328
 329 /**
 330  * il_add_station_common -
 331  */
 332 int
 333 il_add_station_common(struct il_priv *il,
 334                         struct il_rxon_context *ctx,
 335                            const u8 *addr, bool is_ap,
 336                            struct ieee80211_sta *sta, u8 *sta_id_r)
 337 {
 338         unsigned long flags_spin;
 339         int ret = 0;
 340         u8 sta_id;
 341         struct il_addsta_cmd sta_cmd;
 342
 343         *sta_id_r = 0;
 344         spin_lock_irqsave(&il->sta_lock, flags_spin);
 345         sta_id = il_prep_station(il, ctx, addr, is_ap, sta);
 346         if (sta_id == IL_INVALID_STATION) {
 347                 IL_ERR("Unable to prepare station %pM for addition\n",
 348                         addr);
 349                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 350                 return -EINVAL;
 351         }
 352
 353         /*
 354          * uCode is not able to deal with multiple requests to add a
 355          * station. Keep track if one is in progress so that we do not send
 356          * another.
 357          */
 358         if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
 359                 D_INFO(
 360                         "STA %d already in process of being added.\n",
 361                        sta_id);
 362                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 363                 return -EEXIST;
 364         }
 365
 366         if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
 367             (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
 368                 D_ASSOC(
 369                         "STA %d (%pM) already added, not adding again.\n",
 370                         sta_id, addr);
 371                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 372                 return -EEXIST;
 373         }
 374
 375         il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
 376         memcpy(&sta_cmd, &il->stations[sta_id].sta,
 377                                 sizeof(struct il_addsta_cmd));
 378         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 379
 380         /* Add station to device's station table */
 381         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
 382         if (ret) {
 383                 spin_lock_irqsave(&il->sta_lock, flags_spin);
 384                 IL_ERR("Adding station %pM failed.\n",
 385                         il->stations[sta_id].sta.sta.addr);
 386                 il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
 387                 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
 388                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 389         }
 390         *sta_id_r = sta_id;
 391         return ret;
 392 }
 393 EXPORT_SYMBOL(il_add_station_common);
 394
 395 /**
 396  * il_sta_ucode_deactivate - deactivate ucode status for a station
 397  *
 398  * il->sta_lock must be held
 399  */
 400 static void il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
 401 {
 402         /* Ucode must be active and driver must be non active */
 403         if ((il->stations[sta_id].used &
 404              (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
 405                                                 IL_STA_UCODE_ACTIVE)
 406                 IL_ERR("removed non active STA %u\n", sta_id);
 407
 408         il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;
 409
 410         memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
 411         D_ASSOC("Removed STA %u\n", sta_id);
 412 }
 413
 414 static int il_send_remove_station(struct il_priv *il,
 415                                    const u8 *addr, int sta_id,
 416                                    bool temporary)
 417 {
 418         struct il_rx_pkt *pkt;
 419         int ret;
 420
 421         unsigned long flags_spin;
 422         struct il_rem_sta_cmd rm_sta_cmd;
 423
 424         struct il_host_cmd cmd = {
 425                 .id = C_REM_STA,
 426                 .len = sizeof(struct il_rem_sta_cmd),
 427                 .flags = CMD_SYNC,
 428                 .data = &rm_sta_cmd,
 429         };
 430
 431         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 432         rm_sta_cmd.num_sta = 1;
 433         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 434
 435         cmd.flags |= CMD_WANT_SKB;
 436
 437         ret = il_send_cmd(il, &cmd);
 438
 439         if (ret)
 440                 return ret;
 441
 442         pkt = (struct il_rx_pkt *)cmd.reply_page;
 443         if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
 444                 IL_ERR("Bad return from C_REM_STA (0x%08X)\n",
 445                           pkt->hdr.flags);
 446                 ret = -EIO;
 447         }
 448
 449         if (!ret) {
 450                 switch (pkt->u.rem_sta.status) {
 451                 case REM_STA_SUCCESS_MSK:
 452                         if (!temporary) {
 453                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
 454                                 il_sta_ucode_deactivate(il, sta_id);
 455                                 spin_unlock_irqrestore(&il->sta_lock,
 456                                                                 flags_spin);
 457                         }
 458                         D_ASSOC("C_REM_STA PASSED\n");
 459                         break;
 460                 default:
 461                         ret = -EIO;
 462                         IL_ERR("C_REM_STA failed\n");
 463                         break;
 464                 }
 465         }
 466         il_free_pages(il, cmd.reply_page);
 467
 468         return ret;
 469 }
 470
 471 /**
 472  * il_remove_station - Remove driver's knowledge of station.
 473  */
 474 int il_remove_station(struct il_priv *il, const u8 sta_id,
 475                        const u8 *addr)
 476 {
 477         unsigned long flags;
 478
 479         if (!il_is_ready(il)) {
 480                 D_INFO(
 481                         "Unable to remove station %pM, device not ready.\n",
 482                         addr);
 483                 /*
 484                  * It is typical for stations to be removed when we are
 485                  * going down. Return success since device will be down
 486                  * soon anyway
 487                  */
 488                 return 0;
 489         }
 490
 491         D_ASSOC("Removing STA from driver:%d  %pM\n",
 492                         sta_id, addr);
 493
 494         if (WARN_ON(sta_id == IL_INVALID_STATION))
 495                 return -EINVAL;
 496
 497         spin_lock_irqsave(&il->sta_lock, flags);
 498
 499         if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
 500                 D_INFO("Removing %pM but non DRIVER active\n",
 501                                 addr);
 502                 goto out_err;
 503         }
 504
 505         if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
 506                 D_INFO("Removing %pM but non UCODE active\n",
 507                                 addr);
 508                 goto out_err;
 509         }
 510
 511         if (il->stations[sta_id].used & IL_STA_LOCAL) {
 512                 kfree(il->stations[sta_id].lq);
 513                 il->stations[sta_id].lq = NULL;
 514         }
 515
 516         il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
 517
 518         il->num_stations--;
 519
 520         BUG_ON(il->num_stations < 0);
 521
 522         spin_unlock_irqrestore(&il->sta_lock, flags);
 523
 524         return il_send_remove_station(il, addr, sta_id, false);
 525 out_err:
 526         spin_unlock_irqrestore(&il->sta_lock, flags);
 527         return -EINVAL;
 528 }
 529 EXPORT_SYMBOL_GPL(il_remove_station);
 530
 531 /**
 532  * il_clear_ucode_stations - clear ucode station table bits
 533  *
 534  * This function clears all the bits in the driver indicating
 535  * which stations are active in the ucode. Call when something
 536  * other than explicit station management would cause this in
 537  * the ucode, e.g. unassociated RXON.
 538  */
 539 void il_clear_ucode_stations(struct il_priv *il,
 540                               struct il_rxon_context *ctx)
 541 {
 542         int i;
 543         unsigned long flags_spin;
 544         bool cleared = false;
 545
 546         D_INFO("Clearing ucode stations in driver\n");
 547
 548         spin_lock_irqsave(&il->sta_lock, flags_spin);
 549         for (i = 0; i < il->hw_params.max_stations; i++) {
 550                 if (ctx && ctx->ctxid != il->stations[i].ctxid)
 551                         continue;
 552
 553                 if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
 554                         D_INFO(
 555                                 "Clearing ucode active for station %d\n", i);
 556                         il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
 557                         cleared = true;
 558                 }
 559         }
 560         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 561
 562         if (!cleared)
 563                 D_INFO(
 564                         "No active stations found to be cleared\n");
 565 }
 566 EXPORT_SYMBOL(il_clear_ucode_stations);
 567
 568 /**
 569  * il_restore_stations() - Restore driver known stations to device
 570  *
 571  * All stations considered active by driver, but not present in ucode, is
 572  * restored.
 573  *
 574  * Function sleeps.
 575  */
 576 void
 577 il_restore_stations(struct il_priv *il, struct il_rxon_context *ctx)
 578 {
 579         struct il_addsta_cmd sta_cmd;
 580         struct il_link_quality_cmd lq;
 581         unsigned long flags_spin;
 582         int i;
 583         bool found = false;
 584         int ret;
 585         bool send_lq;
 586
 587         if (!il_is_ready(il)) {
 588                 D_INFO(
 589                         "Not ready yet, not restoring any stations.\n");
 590                 return;
 591         }
 592
 593         D_ASSOC("Restoring all known stations ... start.\n");
 594         spin_lock_irqsave(&il->sta_lock, flags_spin);
 595         for (i = 0; i < il->hw_params.max_stations; i++) {
 596                 if (ctx->ctxid != il->stations[i].ctxid)
 597                         continue;
 598                 if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
 599                     !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
 600                         D_ASSOC("Restoring sta %pM\n",
 601                                         il->stations[i].sta.sta.addr);
 602                         il->stations[i].sta.mode = 0;
 603                         il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
 604                         found = true;
 605                 }
 606         }
 607
 608         for (i = 0; i < il->hw_params.max_stations; i++) {
 609                 if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
 610                         memcpy(&sta_cmd, &il->stations[i].sta,
 611                                sizeof(struct il_addsta_cmd));
 612                         send_lq = false;
 613                         if (il->stations[i].lq) {
 614                                 memcpy(&lq, il->stations[i].lq,
 615                                        sizeof(struct il_link_quality_cmd));
 616                                 send_lq = true;
 617                         }
 618                         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 619                         ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
 620                         if (ret) {
 621                                 spin_lock_irqsave(&il->sta_lock, flags_spin);
 622                                 IL_ERR("Adding station %pM failed.\n",
 623                                         il->stations[i].sta.sta.addr);
 624                                 il->stations[i].used &=
 625                                                 ~IL_STA_DRIVER_ACTIVE;
 626                                 il->stations[i].used &=
 627                                                 ~IL_STA_UCODE_INPROGRESS;
 628                                 spin_unlock_irqrestore(&il->sta_lock,
 629                                                                 flags_spin);
 630                         }
 631                         /*
 632                          * Rate scaling has already been initialized, send
 633                          * current LQ command
 634                          */
 635                         if (send_lq)
 636                                 il_send_lq_cmd(il, ctx, &lq,
 637                                                                 CMD_SYNC, true);
 638                         spin_lock_irqsave(&il->sta_lock, flags_spin);
 639                         il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
 640                 }
 641         }
 642
 643         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 644         if (!found)
 645                 D_INFO("Restoring all known stations"
 646                                 " .... no stations to be restored.\n");
 647         else
 648                 D_INFO("Restoring all known stations"
 649                                 " .... complete.\n");
 650 }
 651 EXPORT_SYMBOL(il_restore_stations);
 652
 653 int il_get_free_ucode_key_idx(struct il_priv *il)
 654 {
 655         int i;
 656
 657         for (i = 0; i < il->sta_key_max_num; i++)
 658                 if (!test_and_set_bit(i, &il->ucode_key_table))
 659                         return i;
 660
 661         return WEP_INVALID_OFFSET;
 662 }
 663 EXPORT_SYMBOL(il_get_free_ucode_key_idx);
 664
 665 void il_dealloc_bcast_stations(struct il_priv *il)
 666 {
 667         unsigned long flags;
 668         int i;
 669
 670         spin_lock_irqsave(&il->sta_lock, flags);
 671         for (i = 0; i < il->hw_params.max_stations; i++) {
 672                 if (!(il->stations[i].used & IL_STA_BCAST))
 673                         continue;
 674
 675                 il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
 676                 il->num_stations--;
 677                 BUG_ON(il->num_stations < 0);
 678                 kfree(il->stations[i].lq);
 679                 il->stations[i].lq = NULL;
 680         }
 681         spin_unlock_irqrestore(&il->sta_lock, flags);
 682 }
 683 EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);
 684
 685 #ifdef CONFIG_IWLEGACY_DEBUG
 686 static void il_dump_lq_cmd(struct il_priv *il,
 687                            struct il_link_quality_cmd *lq)
 688 {
 689         int i;
 690         D_RATE("lq station id 0x%x\n", lq->sta_id);
 691         D_RATE("lq ant 0x%X 0x%X\n",
 692                        lq->general_params.single_stream_ant_msk,
 693                        lq->general_params.dual_stream_ant_msk);
 694
 695         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 696                 D_RATE("lq idx %d 0x%X\n",
 697                                i, lq->rs_table[i].rate_n_flags);
 698 }
 699 #else
 700 static inline void il_dump_lq_cmd(struct il_priv *il,
 701                                    struct il_link_quality_cmd *lq)
 702 {
 703 }
 704 #endif
 705
 706 /**
 707  * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
 708  *
 709  * It sometimes happens when a HT rate has been in use and we
 710  * loose connectivity with AP then mac80211 will first tell us that the
 711  * current channel is not HT anymore before removing the station. In such a
 712  * scenario the RXON flags will be updated to indicate we are not
 713  * communicating HT anymore, but the LQ command may still contain HT rates.
 714  * Test for this to prevent driver from sending LQ command between the time
 715  * RXON flags are updated and when LQ command is updated.
 716  */
 717 static bool il_is_lq_table_valid(struct il_priv *il,
 718                               struct il_rxon_context *ctx,
 719                               struct il_link_quality_cmd *lq)
 720 {
 721         int i;
 722
 723         if (ctx->ht.enabled)
 724                 return true;
 725
 726         D_INFO("Channel %u is not an HT channel\n",
 727                        ctx->active.channel);
 728         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 729                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
 730                                                 RATE_MCS_HT_MSK) {
 731                         D_INFO(
 732                                        "idx %d of LQ expects HT channel\n",
 733                                        i);
 734                         return false;
 735                 }
 736         }
 737         return true;
 738 }
 739
 740 /**
 741  * il_send_lq_cmd() - Send link quality command
 742  * @init: This command is sent as part of station initialization right
 743  *        after station has been added.
 744  *
 745  * The link quality command is sent as the last step of station creation.
 746  * This is the special case in which init is set and we call a callback in
 747  * this case to clear the state indicating that station creation is in
 748  * progress.
 749  */
 750 int il_send_lq_cmd(struct il_priv *il, struct il_rxon_context *ctx,
 751                     struct il_link_quality_cmd *lq, u8 flags, bool init)
 752 {
 753         int ret = 0;
 754         unsigned long flags_spin;
 755
 756         struct il_host_cmd cmd = {
 757                 .id = C_TX_LINK_QUALITY_CMD,
 758                 .len = sizeof(struct il_link_quality_cmd),
 759                 .flags = flags,
 760                 .data = lq,
 761         };
 762
 763         if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
 764                 return -EINVAL;
 765
 766
 767         spin_lock_irqsave(&il->sta_lock, flags_spin);
 768         if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
 769                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 770                 return -EINVAL;
 771         }
 772         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 773
 774         il_dump_lq_cmd(il, lq);
 775         BUG_ON(init && (cmd.flags & CMD_ASYNC));
 776
 777         if (il_is_lq_table_valid(il, ctx, lq))
 778                 ret = il_send_cmd(il, &cmd);
 779         else
 780                 ret = -EINVAL;
 781
 782         if (cmd.flags & CMD_ASYNC)
 783                 return ret;
 784
 785         if (init) {
 786                 D_INFO("init LQ command complete,"
 787                                 " clearing sta addition status for sta %d\n",
 788                                lq->sta_id);
 789                 spin_lock_irqsave(&il->sta_lock, flags_spin);
 790                 il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
 791                 spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 792         }
 793         return ret;
 794 }
 795 EXPORT_SYMBOL(il_send_lq_cmd);
 796
 797 int il_mac_sta_remove(struct ieee80211_hw *hw,
 798                        struct ieee80211_vif *vif,
 799                        struct ieee80211_sta *sta)
 800 {
 801         struct il_priv *il = hw->priv;
 802         struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
 803         int ret;
 804
 805         D_INFO("received request to remove station %pM\n",
 806                         sta->addr);
 807         mutex_lock(&il->mutex);
 808         D_INFO("proceeding to remove station %pM\n",
 809                         sta->addr);
 810         ret = il_remove_station(il, sta_common->sta_id, sta->addr);
 811         if (ret)
 812                 IL_ERR("Error removing station %pM\n",
 813                         sta->addr);
 814         mutex_unlock(&il->mutex);
 815         return ret;
 816 }
 817 EXPORT_SYMBOL(il_mac_sta_remove);