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                 /*
 141                  * BET has only a minor effect in 5GHz and masks
 142                  * channel switch IEs, so we only enable BET on 2.4GHz
 143                 */
 144                 if (wlvif->band == IEEE80211_BAND_2GHZ)
 145                         /* enable beacon early termination */
 146                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 147
 148                 if (wlvif->ps_compl) {
 149                         complete(wlvif->ps_compl);
 150                         wlvif->ps_compl = NULL;
 151                 }
 152                 break;
 153         default:
 154                 break;
 155         }
 156
 157         return ret;
 158 }
 159
 160 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 161                                       struct wl12xx_vif *wlvif,
 162                                       struct event_mailbox *mbox)
 163 {
 164         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 165         enum nl80211_cqm_rssi_threshold_event event;
 166         s8 metric = mbox->rssi_snr_trigger_metric[0];
 167
 168         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 169
 170         if (metric <= wlvif->rssi_thold)
 171                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 172         else
 173                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 174
 175         if (event != wlvif->last_rssi_event)
 176                 ieee80211_cqm_rssi_notify(vif, event, GFP_KERNEL);
 177         wlvif->last_rssi_event = event;
 178 }
 179
 180 static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 181 {
 182         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 183
 184         if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 185                 if (!wlvif->sta.ba_rx_bitmap)
 186                         return;
 187                 ieee80211_stop_rx_ba_session(vif, wlvif->sta.ba_rx_bitmap,
 188                                              vif->bss_conf.bssid);
 189         } else {
 190                 u8 hlid;
 191                 struct wl1271_link *lnk;
 192                 for_each_set_bit(hlid, wlvif->ap.sta_hlid_map,
 193                                  WL12XX_MAX_LINKS) {
 194                         lnk = &wl->links[hlid];
 195                         if (!lnk->ba_bitmap)
 196                                 continue;
 197
 198                         ieee80211_stop_rx_ba_session(vif,
 199                                                      lnk->ba_bitmap,
 200                                                      lnk->addr);
 201                 }
 202         }
 203 }
 204
 205 static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
 206                                                u8 enable)
 207 {
 208         struct ieee80211_vif *vif;
 209         struct wl12xx_vif *wlvif;
 210
 211         if (enable) {
 212                 /* disable dynamic PS when requested by the firmware */
 213                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 214                         vif = wl12xx_wlvif_to_vif(wlvif);
 215                         ieee80211_disable_dyn_ps(vif);
 216                 }
 217                 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 218         } else {
 219                 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 220                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 221                         vif = wl12xx_wlvif_to_vif(wlvif);
 222                         ieee80211_enable_dyn_ps(vif);
 223                         wl1271_recalc_rx_streaming(wl, wlvif);
 224                 }
 225         }
 226
 227 }
 228
 229 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 230 {
 231         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 232         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 233         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 234 }
 235
 236 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 237 {
 238         struct ieee80211_vif *vif;
 239         struct wl12xx_vif *wlvif;
 240         int ret;
 241         u32 vector;
 242         bool beacon_loss = false;
 243         bool disconnect_sta = false;
 244         unsigned long sta_bitmap = 0;
 245
 246         wl1271_event_mbox_dump(mbox);
 247
 248         vector = le32_to_cpu(mbox->events_vector);
 249         vector &= ~(le32_to_cpu(mbox->events_mask));
 250         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 251
 252         if (vector & SCAN_COMPLETE_EVENT_ID) {
 253                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 254                              mbox->scheduled_scan_status);
 255
 256                 wl1271_scan_stm(wl, wl->scan_vif);
 257         }
 258
 259         if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
 260                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
 261                              "(status 0x%0x)", mbox->scheduled_scan_status);
 262
 263                 wl1271_scan_sched_scan_results(wl);
 264         }
 265
 266         if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
 267                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
 268                              "(status 0x%0x)", mbox->scheduled_scan_status);
 269                 if (wl->sched_scanning) {
 270                         ieee80211_sched_scan_stopped(wl->hw);
 271                         wl->sched_scanning = false;
 272                 }
 273         }
 274
 275         if (vector & SOFT_GEMINI_SENSE_EVENT_ID)
 276                 wl12xx_event_soft_gemini_sense(wl,
 277                                                mbox->soft_gemini_sense_info);
 278
 279         /*
 280          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 281          * filtering) is enabled. Without PSM, the stack will receive all
 282          * beacons and can detect beacon loss by itself.
 283          *
 284          * As there's possibility that the driver disables PSM before receiving
 285          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 286          *
 287          */
 288         if (vector & BSS_LOSE_EVENT_ID) {
 289                 /* TODO: check for multi-role */
 290                 wl1271_info("Beacon loss detected.");
 291
 292                 /* indicate to the stack, that beacons have been lost */
 293                 beacon_loss = true;
 294         }
 295
 296         if (vector & PS_REPORT_EVENT_ID) {
 297                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 298                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 299                         ret = wl1271_event_ps_report(wl, wlvif,
 300                                                      mbox, &beacon_loss);
 301                         if (ret < 0)
 302                                 return ret;
 303                 }
 304         }
 305
 306         if (vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID)
 307                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 308                         wl1271_event_pspoll_delivery_fail(wl, wlvif);
 309                 }
 310
 311         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 312                 /* TODO: check actual multi-role support */
 313                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 314                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 315                         wl1271_event_rssi_trigger(wl, wlvif, mbox);
 316                 }
 317         }
 318
 319         if (vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) {
 320                 u8 role_id = mbox->role_id;
 321                 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
 322                              "ba_allowed = 0x%x, role_id=%d",
 323                              mbox->rx_ba_allowed, role_id);
 324
 325                 wl12xx_for_each_wlvif(wl, wlvif) {
 326                         if (role_id != 0xff && role_id != wlvif->role_id)
 327                                 continue;
 328
 329                         wlvif->ba_allowed = !!mbox->rx_ba_allowed;
 330                         if (!wlvif->ba_allowed)
 331                                 wl1271_stop_ba_event(wl, wlvif);
 332                 }
 333         }
 334
 335         if (vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) {
 336                 wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
 337                                           "status = 0x%x",
 338                                           mbox->channel_switch_status);
 339                 /*
 340                  * That event uses for two cases:
 341                  * 1) channel switch complete with status=0
 342                  * 2) channel switch failed status=1
 343                  */
 344
 345                 /* TODO: configure only the relevant vif */
 346                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 347                         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
 348                         bool success;
 349
 350                         if (!test_and_clear_bit(WLVIF_FLAG_CS_PROGRESS,
 351                                                 &wl->flags))
 352                                 continue;
 353
 354                         success = mbox->channel_switch_status ? false : true;
 355                         ieee80211_chswitch_done(vif, success);
 356                 }
 357         }
 358
 359         if ((vector & DUMMY_PACKET_EVENT_ID)) {
 360                 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 361                 wl1271_tx_dummy_packet(wl);
 362         }
 363
 364         /*
 365          * "TX retries exceeded" has a different meaning according to mode.
 366          * In AP mode the offending station is disconnected.
 367          */
 368         if (vector & MAX_TX_RETRY_EVENT_ID) {
 369                 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
 370                 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
 371                 disconnect_sta = true;
 372         }
 373
 374         if (vector & INACTIVE_STA_EVENT_ID) {
 375                 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
 376                 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
 377                 disconnect_sta = true;
 378         }
 379
 380         if (disconnect_sta) {
 381                 u32 num_packets = wl->conf.tx.max_tx_retries;
 382                 struct ieee80211_sta *sta;
 383                 const u8 *addr;
 384                 int h;
 385
 386                 for_each_set_bit(h, &sta_bitmap, WL12XX_MAX_LINKS) {
 387                         bool found = false;
 388                         /* find the ap vif connected to this sta */
 389                         wl12xx_for_each_wlvif_ap(wl, wlvif) {
 390                                 if (!test_bit(h, wlvif->ap.sta_hlid_map))
 391                                         continue;
 392                                 found = true;
 393                                 break;
 394                         }
 395                         if (!found)
 396                                 continue;
 397
 398                         vif = wl12xx_wlvif_to_vif(wlvif);
 399                         addr = wl->links[h].addr;
 400
 401                         rcu_read_lock();
 402                         sta = ieee80211_find_sta(vif, addr);
 403                         if (sta) {
 404                                 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
 405                                 ieee80211_report_low_ack(sta, num_packets);
 406                         }
 407                         rcu_read_unlock();
 408                 }
 409         }
 410
 411         if (beacon_loss)
 412                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 413                         vif = wl12xx_wlvif_to_vif(wlvif);
 414                         ieee80211_connection_loss(vif);
 415                 }
 416
 417         return 0;
 418 }
 419
 420 int wl1271_event_unmask(struct wl1271 *wl)
 421 {
 422         int ret;
 423
 424         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 425         if (ret < 0)
 426                 return ret;
 427
 428         return 0;
 429 }
 430
 431 void wl1271_event_mbox_config(struct wl1271 *wl)
 432 {
 433         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 434         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 435
 436         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 437                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 438 }
 439
 440 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 441 {
 442         struct event_mailbox mbox;
 443         int ret;
 444
 445         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 446
 447         if (mbox_num > 1)
 448                 return -EINVAL;
 449
 450         /* first we read the mbox descriptor */
 451         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 452                     sizeof(struct event_mailbox), false);
 453
 454         /* process the descriptor */
 455         ret = wl1271_event_process(wl, &mbox);
 456         if (ret < 0)
 457                 return ret;
 458
 459         /* then we let the firmware know it can go on...*/
 460         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 461
 462         return 0;
 463 }