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