drivers/net/wireless/wl12xx/event.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "wl12xx.h"
  25 #include "debug.h"
  26 #include "reg.h"
  27 #include "io.h"
  28 #include "event.h"
  29 #include "ps.h"
  30 #include "scan.h"
  31 #include "wl12xx_80211.h"
  32
  33 void wl1271_pspoll_work(struct work_struct *work)
  34 {
  35         struct ieee80211_vif *vif;
  36         struct wl12xx_vif *wlvif;
  37         struct delayed_work *dwork;
  38         struct wl1271 *wl;
  39         int ret;
  40
  41         dwork = container_of(work, struct delayed_work, work);
  42         wlvif = container_of(dwork, struct wl12xx_vif, pspoll_work);
  43         vif = container_of((void *)wlvif, struct ieee80211_vif, drv_priv);
  44         wl = wlvif->wl;
  45
  46         wl1271_debug(DEBUG_EVENT, "pspoll work");
  47
  48         mutex_lock(&wl->mutex);
  49
  50         if (unlikely(wl->state == WL1271_STATE_OFF))
  51                 goto out;
  52
  53         if (!test_and_clear_bit(WLVIF_FLAG_PSPOLL_FAILURE, &wlvif->flags))
  54                 goto out;
  55
  56         if (!test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
  57                 goto out;
  58
  59         /*
  60          * if we end up here, then we were in powersave when the pspoll
  61          * delivery failure occurred, and no-one changed state since, so
  62          * we should go back to powersave.
  63          */
  64         ret = wl1271_ps_elp_wakeup(wl);
  65         if (ret < 0)
  66                 goto out;
  67
  68         wl1271_ps_set_mode(wl, wlvif, STATION_POWER_SAVE_MODE,
  69                            wlvif->basic_rate, true);
  70
  71         wl1271_ps_elp_sleep(wl);
  72 out:
  73         mutex_unlock(&wl->mutex);
  74 };
  75
  76 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl,
  77                                               struct wl12xx_vif *wlvif)
  78 {
  79         int delay = wl->conf.conn.ps_poll_recovery_period;
  80         int ret;
  81
  82         wlvif->ps_poll_failures++;
  83         if (wlvif->ps_poll_failures == 1)
  84                 wl1271_info("AP with dysfunctional ps-poll, "
  85                             "trying to work around it.");
  86
  87         /* force active mode receive data from the AP */
  88         if (test_bit(WLVIF_FLAG_PSM, &wlvif->flags)) {
  89                 ret = wl1271_ps_set_mode(wl, wlvif, STATION_ACTIVE_MODE,
  90                                          wlvif->basic_rate, true);
  91                 if (ret < 0)
  92                         return;
  93                 set_bit(WLVIF_FLAG_PSPOLL_FAILURE, &wlvif->flags);
  94                 ieee80211_queue_delayed_work(wl->hw, &wlvif->pspoll_work,
  95                                              msecs_to_jiffies(delay));
  96         }
  97
  98         /*
  99          * If already in active mode, lets we should be getting data from
 100          * the AP right away. If we enter PSM too fast after this, and data
 101          * remains on the AP, we will get another event like this, and we'll
 102          * go into active once more.
 103          */
 104 }
 105
 106 static int wl1271_event_ps_report(struct wl1271 *wl,
 107                                   struct wl12xx_vif *wlvif,
 108                                   struct event_mailbox *mbox,
 109                                   bool *beacon_loss)
 110 {
 111         int ret = 0;
 112         u32 total_retries = wl->conf.conn.psm_entry_retries;
 113
 114         wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
 115
 116         switch (mbox->ps_status) {
 117         case EVENT_ENTER_POWER_SAVE_FAIL:
 118                 wl1271_debug(DEBUG_PSM, "PSM entry failed");
 119
 120                 if (!test_bit(WLVIF_FLAG_PSM, &wlvif->flags)) {
 121                         /* remain in active mode */
 122                         wlvif->psm_entry_retry = 0;
 123                         break;
 124                 }
 125
 126                 if (wlvif->psm_entry_retry < total_retries) {
 127                         wlvif->psm_entry_retry++;
 128                         ret = wl1271_ps_set_mode(wl, wlvif,
 129                                                  STATION_POWER_SAVE_MODE,
 130                                                  wlvif->basic_rate, true);
 131                 } else {
 132                         wl1271_info("No ack to nullfunc from AP.");
 133                         wlvif->psm_entry_retry = 0;
 134                         *beacon_loss = true;
 135                 }
 136                 break;
 137         case EVENT_ENTER_POWER_SAVE_SUCCESS:
 138                 wlvif->psm_entry_retry = 0;
 139
 140                 /* enable beacon filtering */
 141                 ret = wl1271_acx_beacon_filter_opt(wl, wlvif, true);
 142                 if (ret < 0)
 143                         break;
 144
 145                 /*
 146                  * BET has only a minor effect in 5GHz and masks
 147                  * channel switch IEs, so we only enable BET on 2.4GHz
 148                 */
 149                 if (wlvif->band == IEEE80211_BAND_2GHZ)
 150                         /* enable beacon early termination */
 151                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 152
 153                 if (wlvif->ps_compl) {
 154                         complete(wlvif->ps_compl);
 155                         wlvif->ps_compl = NULL;
 156                 }
 157                 break;
 158         default:
 159                 break;
 160         }
 161
 162         return ret;
 163 }
 164
 165 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 166                                       struct wl12xx_vif *wlvif,
 167                                       struct event_mailbox *mbox)
 168 {
 169         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 170         enum nl80211_cqm_rssi_threshold_event event;
 171         s8 metric = mbox->rssi_snr_trigger_metric[0];
 172
 173         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 174
 175         if (metric <= wlvif->rssi_thold)
 176                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 177         else
 178                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 179
 180         if (event != wlvif->last_rssi_event)
 181                 ieee80211_cqm_rssi_notify(vif, event, GFP_KERNEL);
 182         wlvif->last_rssi_event = event;
 183 }
 184
 185 static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 186 {
 187         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 188
 189         if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 190                 if (!wlvif->sta.ba_rx_bitmap)
 191                         return;
 192                 ieee80211_stop_rx_ba_session(vif, wlvif->sta.ba_rx_bitmap,
 193                                              vif->bss_conf.bssid);
 194         } else {
 195                 u8 hlid;
 196                 struct wl1271_link *lnk;
 197                 for_each_set_bit(hlid, wlvif->ap.sta_hlid_map,
 198                                  WL12XX_MAX_LINKS) {
 199                         lnk = &wl->links[hlid];
 200                         if (!lnk->ba_bitmap)
 201                                 continue;
 202
 203                         ieee80211_stop_rx_ba_session(vif,
 204                                                      lnk->ba_bitmap,
 205                                                      lnk->addr);
 206                 }
 207         }
 208 }
 209
 210 static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
 211                                                u8 enable)
 212 {
 213         struct ieee80211_vif *vif;
 214         struct wl12xx_vif *wlvif;
 215
 216         if (enable) {
 217                 /* disable dynamic PS when requested by the firmware */
 218                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 219                         vif = wl12xx_wlvif_to_vif(wlvif);
 220                         ieee80211_disable_dyn_ps(vif);
 221                 }
 222                 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 223         } else {
 224                 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 225                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 226                         vif = wl12xx_wlvif_to_vif(wlvif);
 227                         ieee80211_enable_dyn_ps(vif);
 228                         wl1271_recalc_rx_streaming(wl, wlvif);
 229                 }
 230         }
 231
 232 }
 233
 234 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 235 {
 236         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 237         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 238         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 239 }
 240
 241 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 242 {
 243         struct ieee80211_vif *vif;
 244         struct wl12xx_vif *wlvif;
 245         int ret;
 246         u32 vector;
 247         bool beacon_loss = false;
 248         bool disconnect_sta = false;
 249         unsigned long sta_bitmap = 0;
 250
 251         wl1271_event_mbox_dump(mbox);
 252
 253         vector = le32_to_cpu(mbox->events_vector);
 254         vector &= ~(le32_to_cpu(mbox->events_mask));
 255         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 256
 257         if (vector & SCAN_COMPLETE_EVENT_ID) {
 258                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 259                              mbox->scheduled_scan_status);
 260
 261                 wl1271_scan_stm(wl, wl->scan_vif);
 262         }
 263
 264         if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
 265                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
 266                              "(status 0x%0x)", mbox->scheduled_scan_status);
 267
 268                 wl1271_scan_sched_scan_results(wl);
 269         }
 270
 271         if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
 272                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
 273                              "(status 0x%0x)", mbox->scheduled_scan_status);
 274                 if (wl->sched_scanning) {
 275                         wl1271_scan_sched_scan_stop(wl);
 276                         ieee80211_sched_scan_stopped(wl->hw);
 277                 }
 278         }
 279
 280         if (vector & SOFT_GEMINI_SENSE_EVENT_ID)
 281                 wl12xx_event_soft_gemini_sense(wl,
 282                                                mbox->soft_gemini_sense_info);
 283
 284         /*
 285          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 286          * filtering) is enabled. Without PSM, the stack will receive all
 287          * beacons and can detect beacon loss by itself.
 288          *
 289          * As there's possibility that the driver disables PSM before receiving
 290          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 291          *
 292          */
 293         if (vector & BSS_LOSE_EVENT_ID) {
 294                 /* TODO: check for multi-role */
 295                 wl1271_info("Beacon loss detected.");
 296
 297                 /* indicate to the stack, that beacons have been lost */
 298                 beacon_loss = true;
 299         }
 300
 301         if (vector & PS_REPORT_EVENT_ID) {
 302                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 303                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 304                         ret = wl1271_event_ps_report(wl, wlvif,
 305                                                      mbox, &beacon_loss);
 306                         if (ret < 0)
 307                                 return ret;
 308                 }
 309         }
 310
 311         if (vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID)
 312                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 313                         wl1271_event_pspoll_delivery_fail(wl, wlvif);
 314                 }
 315
 316         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 317                 /* TODO: check actual multi-role support */
 318                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 319                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 320                         wl1271_event_rssi_trigger(wl, wlvif, mbox);
 321                 }
 322         }
 323
 324         if (vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) {
 325                 u8 role_id = mbox->role_id;
 326                 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
 327                              "ba_allowed = 0x%x, role_id=%d",
 328                              mbox->rx_ba_allowed, role_id);
 329
 330                 wl12xx_for_each_wlvif(wl, wlvif) {
 331                         if (role_id != 0xff && role_id != wlvif->role_id)
 332                                 continue;
 333
 334                         wlvif->ba_allowed = !!mbox->rx_ba_allowed;
 335                         if (!wlvif->ba_allowed)
 336                                 wl1271_stop_ba_event(wl, wlvif);
 337                 }
 338         }
 339
 340         if (vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) {
 341                 wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
 342                                           "status = 0x%x",
 343                                           mbox->channel_switch_status);
 344                 /*
 345                  * That event uses for two cases:
 346                  * 1) channel switch complete with status=0
 347                  * 2) channel switch failed status=1
 348                  */
 349
 350                 /* TODO: configure only the relevant vif */
 351                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 352                         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 353                         bool success;
 354
 355                         if (!test_and_clear_bit(WLVIF_FLAG_CS_PROGRESS,
 356                                                 &wl->flags))
 357                                 continue;
 358
 359                         success = mbox->channel_switch_status ? false : true;
 360                         ieee80211_chswitch_done(vif, success);
 361                 }
 362         }
 363
 364         if ((vector & DUMMY_PACKET_EVENT_ID)) {
 365                 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 366                 wl1271_tx_dummy_packet(wl);
 367         }
 368
 369         /*
 370          * "TX retries exceeded" has a different meaning according to mode.
 371          * In AP mode the offending station is disconnected.
 372          */
 373         if (vector & MAX_TX_RETRY_EVENT_ID) {
 374                 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
 375                 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
 376                 disconnect_sta = true;
 377         }
 378
 379         if (vector & INACTIVE_STA_EVENT_ID) {
 380                 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
 381                 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
 382                 disconnect_sta = true;
 383         }
 384
 385         if (disconnect_sta) {
 386                 u32 num_packets = wl->conf.tx.max_tx_retries;
 387                 struct ieee80211_sta *sta;
 388                 const u8 *addr;
 389                 int h;
 390
 391                 for_each_set_bit(h, &sta_bitmap, WL12XX_MAX_LINKS) {
 392                         bool found = false;
 393                         /* find the ap vif connected to this sta */
 394                         wl12xx_for_each_wlvif_ap(wl, wlvif) {
 395                                 if (!test_bit(h, wlvif->ap.sta_hlid_map))
 396                                         continue;
 397                                 found = true;
 398                                 break;
 399                         }
 400                         if (!found)
 401                                 continue;
 402
 403                         vif = wl12xx_wlvif_to_vif(wlvif);
 404                         addr = wl->links[h].addr;
 405
 406                         rcu_read_lock();
 407                         sta = ieee80211_find_sta(vif, addr);
 408                         if (sta) {
 409                                 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
 410                                 ieee80211_report_low_ack(sta, num_packets);
 411                         }
 412                         rcu_read_unlock();
 413                 }
 414         }
 415
 416         if (beacon_loss)
 417                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 418                         vif = wl12xx_wlvif_to_vif(wlvif);
 419                         ieee80211_connection_loss(vif);
 420                 }
 421
 422         return 0;
 423 }
 424
 425 int wl1271_event_unmask(struct wl1271 *wl)
 426 {
 427         int ret;
 428
 429         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 430         if (ret < 0)
 431                 return ret;
 432
 433         return 0;
 434 }
 435
 436 void wl1271_event_mbox_config(struct wl1271 *wl)
 437 {
 438         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 439         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 440
 441         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 442                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 443 }
 444
 445 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 446 {
 447         struct event_mailbox mbox;
 448         int ret;
 449
 450         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 451
 452         if (mbox_num > 1)
 453                 return -EINVAL;
 454
 455         /* first we read the mbox descriptor */
 456         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 457                     sizeof(struct event_mailbox), false);
 458
 459         /* process the descriptor */
 460         ret = wl1271_event_process(wl, &mbox);
 461         if (ret < 0)
 462                 return ret;
 463
 464         /* then we let the firmware know it can go on...*/
 465         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 466
 467         return 0;
 468 }