drivers/net/wireless/ath/ath9k/channel.c

   1 /*
   2  * Copyright (c) 2014 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "ath9k.h"
  18
  19 /* Set/change channels.  If the channel is really being changed, it's done
  20  * by reseting the chip.  To accomplish this we must first cleanup any pending
  21  * DMA, then restart stuff.
  22  */
  23 static int ath_set_channel(struct ath_softc *sc)
  24 {
  25         struct ath_hw *ah = sc->sc_ah;
  26         struct ath_common *common = ath9k_hw_common(ah);
  27         struct ieee80211_hw *hw = sc->hw;
  28         struct ath9k_channel *hchan;
  29         struct cfg80211_chan_def *chandef = &sc->cur_chan->chandef;
  30         struct ieee80211_channel *chan = chandef->chan;
  31         int pos = chan->hw_value;
  32         int old_pos = -1;
  33         int r;
  34
  35         if (test_bit(ATH_OP_INVALID, &common->op_flags))
  36                 return -EIO;
  37
  38         if (ah->curchan)
  39                 old_pos = ah->curchan - &ah->channels[0];
  40
  41         ath_dbg(common, CONFIG, "Set channel: %d MHz width: %d\n",
  42                 chan->center_freq, chandef->width);
  43
  44         /* update survey stats for the old channel before switching */
  45         spin_lock_bh(&common->cc_lock);
  46         ath_update_survey_stats(sc);
  47         spin_unlock_bh(&common->cc_lock);
  48
  49         ath9k_cmn_get_channel(hw, ah, chandef);
  50
  51         /* If the operating channel changes, change the survey in-use flags
  52          * along with it.
  53          * Reset the survey data for the new channel, unless we're switching
  54          * back to the operating channel from an off-channel operation.
  55          */
  56         if (!sc->cur_chan->offchannel && sc->cur_survey != &sc->survey[pos]) {
  57                 if (sc->cur_survey)
  58                         sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
  59
  60                 sc->cur_survey = &sc->survey[pos];
  61
  62                 memset(sc->cur_survey, 0, sizeof(struct survey_info));
  63                 sc->cur_survey->filled |= SURVEY_INFO_IN_USE;
  64         } else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) {
  65                 memset(&sc->survey[pos], 0, sizeof(struct survey_info));
  66         }
  67
  68         hchan = &sc->sc_ah->channels[pos];
  69         r = ath_reset_internal(sc, hchan);
  70         if (r)
  71                 return r;
  72
  73         /* The most recent snapshot of channel->noisefloor for the old
  74          * channel is only available after the hardware reset. Copy it to
  75          * the survey stats now.
  76          */
  77         if (old_pos >= 0)
  78                 ath_update_survey_nf(sc, old_pos);
  79
  80         /* Enable radar pulse detection if on a DFS channel. Spectral
  81          * scanning and radar detection can not be used concurrently.
  82          */
  83         if (hw->conf.radar_enabled) {
  84                 u32 rxfilter;
  85
  86                 /* set HW specific DFS configuration */
  87                 ath9k_hw_set_radar_params(ah);
  88                 rxfilter = ath9k_hw_getrxfilter(ah);
  89                 rxfilter |= ATH9K_RX_FILTER_PHYRADAR |
  90                                 ATH9K_RX_FILTER_PHYERR;
  91                 ath9k_hw_setrxfilter(ah, rxfilter);
  92                 ath_dbg(common, DFS, "DFS enabled at freq %d\n",
  93                         chan->center_freq);
  94         } else {
  95                 /* perform spectral scan if requested. */
  96                 if (test_bit(ATH_OP_SCANNING, &common->op_flags) &&
  97                         sc->spectral_mode == SPECTRAL_CHANSCAN)
  98                         ath9k_spectral_scan_trigger(hw);
  99         }
 100
 101         return 0;
 102 }
 103
 104 void ath_chanctx_init(struct ath_softc *sc)
 105 {
 106         struct ath_chanctx *ctx;
 107         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 108         struct ieee80211_supported_band *sband;
 109         struct ieee80211_channel *chan;
 110         int i, j;
 111
 112         sband = &common->sbands[IEEE80211_BAND_2GHZ];
 113         if (!sband->n_channels)
 114                 sband = &common->sbands[IEEE80211_BAND_5GHZ];
 115
 116         chan = &sband->channels[0];
 117         for (i = 0; i < ATH9K_NUM_CHANCTX; i++) {
 118                 ctx = &sc->chanctx[i];
 119                 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
 120                 INIT_LIST_HEAD(&ctx->vifs);
 121                 ctx->txpower = ATH_TXPOWER_MAX;
 122                 for (j = 0; j < ARRAY_SIZE(ctx->acq); j++)
 123                         INIT_LIST_HEAD(&ctx->acq[j]);
 124         }
 125 }
 126
 127 void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
 128                              struct cfg80211_chan_def *chandef)
 129 {
 130         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 131         bool cur_chan;
 132
 133         spin_lock_bh(&sc->chan_lock);
 134         if (chandef)
 135                 memcpy(&ctx->chandef, chandef, sizeof(*chandef));
 136         cur_chan = sc->cur_chan == ctx;
 137         spin_unlock_bh(&sc->chan_lock);
 138
 139         if (!cur_chan) {
 140                 ath_dbg(common, CHAN_CTX,
 141                         "Current context differs from the new context\n");
 142                 return;
 143         }
 144
 145         ath_set_channel(sc);
 146 }
 147
 148 #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
 149
 150 /**********************************************************/
 151 /* Functions to handle the channel context state machine. */
 152 /**********************************************************/
 153
 154 static const char *offchannel_state_string(enum ath_offchannel_state state)
 155 {
 156         switch (state) {
 157                 case_rtn_string(ATH_OFFCHANNEL_IDLE);
 158                 case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
 159                 case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
 160                 case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
 161                 case_rtn_string(ATH_OFFCHANNEL_ROC_START);
 162                 case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
 163                 case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
 164         default:
 165                 return "unknown";
 166         }
 167 }
 168
 169 static const char *chanctx_event_string(enum ath_chanctx_event ev)
 170 {
 171         switch (ev) {
 172                 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
 173                 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
 174                 case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
 175                 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
 176                 case_rtn_string(ATH_CHANCTX_EVENT_ASSOC);
 177                 case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
 178                 case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
 179                 case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
 180                 case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
 181                 case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
 182         default:
 183                 return "unknown";
 184         }
 185 }
 186
 187 static const char *chanctx_state_string(enum ath_chanctx_state state)
 188 {
 189         switch (state) {
 190                 case_rtn_string(ATH_CHANCTX_STATE_IDLE);
 191                 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
 192                 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
 193                 case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
 194                 case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
 195         default:
 196                 return "unknown";
 197         }
 198 }
 199
 200 void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
 201 {
 202         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 203         struct ath_vif *avp;
 204         bool active = false;
 205         u8 n_active = 0;
 206
 207         if (!ctx)
 208                 return;
 209
 210         list_for_each_entry(avp, &ctx->vifs, list) {
 211                 struct ieee80211_vif *vif = avp->vif;
 212
 213                 switch (vif->type) {
 214                 case NL80211_IFTYPE_P2P_CLIENT:
 215                 case NL80211_IFTYPE_STATION:
 216                         if (vif->bss_conf.assoc)
 217                                 active = true;
 218                         break;
 219                 default:
 220                         active = true;
 221                         break;
 222                 }
 223         }
 224         ctx->active = active;
 225
 226         ath_for_each_chanctx(sc, ctx) {
 227                 if (!ctx->assigned || list_empty(&ctx->vifs))
 228                         continue;
 229                 n_active++;
 230         }
 231
 232         if (n_active <= 1) {
 233                 clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
 234                 return;
 235         }
 236         if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
 237                 return;
 238
 239         if (ath9k_is_chanctx_enabled()) {
 240                 ath_chanctx_event(sc, NULL,
 241                                   ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
 242         }
 243 }
 244
 245 static struct ath_chanctx *
 246 ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
 247 {
 248         int idx = ctx - &sc->chanctx[0];
 249
 250         return &sc->chanctx[!idx];
 251 }
 252
 253 static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
 254 {
 255         struct ath_chanctx *prev, *cur;
 256         struct timespec ts;
 257         u32 cur_tsf, prev_tsf, beacon_int;
 258         s32 offset;
 259
 260         beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
 261
 262         cur = sc->cur_chan;
 263         prev = ath_chanctx_get_next(sc, cur);
 264
 265         getrawmonotonic(&ts);
 266         cur_tsf = (u32) cur->tsf_val +
 267                   ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
 268
 269         prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
 270         prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
 271
 272         /* Adjust the TSF time of the AP chanctx to keep its beacons
 273          * at half beacon interval offset relative to the STA chanctx.
 274          */
 275         offset = cur_tsf - prev_tsf;
 276
 277         /* Ignore stale data or spurious timestamps */
 278         if (offset < 0 || offset > 3 * beacon_int)
 279                 return;
 280
 281         offset = beacon_int / 2 - (offset % beacon_int);
 282         prev->tsf_val += offset;
 283 }
 284
 285 /* Configure the TSF based hardware timer for a channel switch.
 286  * Also set up backup software timer, in case the gen timer fails.
 287  * This could be caused by a hardware reset.
 288  */
 289 static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time)
 290 {
 291         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 292         struct ath_hw *ah = sc->sc_ah;
 293
 294         ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
 295         tsf_time -= ath9k_hw_gettsf32(ah);
 296         tsf_time = msecs_to_jiffies(tsf_time / 1000) + 1;
 297         mod_timer(&sc->sched.timer, jiffies + tsf_time);
 298
 299         ath_dbg(common, CHAN_CTX,
 300                 "Setup chanctx timer with timeout: %d ms\n", jiffies_to_msecs(tsf_time));
 301 }
 302
 303 void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
 304                        enum ath_chanctx_event ev)
 305 {
 306         struct ath_hw *ah = sc->sc_ah;
 307         struct ath_common *common = ath9k_hw_common(ah);
 308         struct ath_beacon_config *cur_conf;
 309         struct ath_vif *avp = NULL;
 310         struct ath_chanctx *ctx;
 311         u32 tsf_time;
 312         u32 beacon_int;
 313
 314         if (vif)
 315                 avp = (struct ath_vif *) vif->drv_priv;
 316
 317         spin_lock_bh(&sc->chan_lock);
 318
 319         ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s\n",
 320                 sc->cur_chan->chandef.center_freq1,
 321                 chanctx_event_string(ev),
 322                 chanctx_state_string(sc->sched.state));
 323
 324         switch (ev) {
 325         case ATH_CHANCTX_EVENT_BEACON_PREPARE:
 326                 if (avp->offchannel_duration)
 327                         avp->offchannel_duration = 0;
 328
 329                 if (avp->chanctx != sc->cur_chan) {
 330                         ath_dbg(common, CHAN_CTX,
 331                                 "Contexts differ, not preparing beacon\n");
 332                         break;
 333                 }
 334
 335                 if (sc->sched.offchannel_pending && !sc->sched.wait_switch) {
 336                         sc->sched.offchannel_pending = false;
 337                         sc->next_chan = &sc->offchannel.chan;
 338                         sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
 339                         ath_dbg(common, CHAN_CTX,
 340                                 "Setting offchannel_pending to false\n");
 341                 }
 342
 343                 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
 344                 if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) {
 345                         sc->next_chan = ctx;
 346                         sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
 347                         ath_dbg(common, CHAN_CTX,
 348                                 "Set next context, move chanctx state to WAIT_FOR_BEACON\n");
 349                 }
 350
 351                 /* if the timer missed its window, use the next interval */
 352                 if (sc->sched.state == ATH_CHANCTX_STATE_WAIT_FOR_TIMER) {
 353                         sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
 354                         ath_dbg(common, CHAN_CTX,
 355                                 "Move chanctx state from WAIT_FOR_TIMER to WAIT_FOR_BEACON\n");
 356                 }
 357
 358                 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
 359                         break;
 360
 361                 ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr);
 362
 363                 sc->sched.beacon_pending = true;
 364                 sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER);
 365
 366                 cur_conf = &sc->cur_chan->beacon;
 367                 beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
 368
 369                 /* defer channel switch by a quarter beacon interval */
 370                 tsf_time = sc->sched.next_tbtt + beacon_int / 4;
 371                 sc->sched.switch_start_time = tsf_time;
 372                 sc->cur_chan->last_beacon = sc->sched.next_tbtt;
 373
 374                 /*
 375                  * If an offchannel switch is scheduled to happen after
 376                  * a beacon transmission, update the NoA with one-shot
 377                  * values and increment the index.
 378                  */
 379                 if (sc->next_chan == &sc->offchannel.chan) {
 380                         avp->noa_index++;
 381                         avp->offchannel_start = tsf_time;
 382                         avp->offchannel_duration = sc->sched.offchannel_duration;
 383
 384                         ath_dbg(common, CHAN_CTX,
 385                                 "offchannel noa_duration: %d, noa_start: %d, noa_index: %d\n",
 386                                 avp->offchannel_duration,
 387                                 avp->offchannel_start,
 388                                 avp->noa_index);
 389
 390                         /*
 391                          * When multiple contexts are active, the NoA
 392                          * has to be recalculated and advertised after
 393                          * an offchannel operation.
 394                          */
 395                         if (ctx->active && avp->noa_duration)
 396                                 avp->noa_duration = 0;
 397
 398                         break;
 399                 }
 400
 401
 402                 /*
 403                  * Clear the extend_absence flag if it had been
 404                  * set during the previous beacon transmission,
 405                  * since we need to revert to the normal NoA
 406                  * schedule.
 407                  */
 408                 if (ctx->active && sc->sched.extend_absence) {
 409                         avp->noa_duration = 0;
 410                         sc->sched.extend_absence = false;
 411                 }
 412
 413                 /* If at least two consecutive beacons were missed on the STA
 414                  * chanctx, stay on the STA channel for one extra beacon period,
 415                  * to resync the timer properly.
 416                  */
 417                 if (ctx->active && sc->sched.beacon_miss >= 2) {
 418                         avp->noa_duration = 0;
 419                         sc->sched.extend_absence = true;
 420                 }
 421                 /* Prevent wrap-around issues */
 422                 if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30))
 423                         avp->noa_duration = 0;
 424
 425                 /*
 426                  * If multiple contexts are active, start periodic
 427                  * NoA and increment the index for the first
 428                  * announcement.
 429                  */
 430                 if (ctx->active &&
 431                     (!avp->noa_duration || sc->sched.force_noa_update)) {
 432                         avp->noa_index++;
 433                         avp->noa_start = tsf_time;
 434
 435                         if (sc->sched.extend_absence)
 436                                 avp->noa_duration = (3 * beacon_int / 2) +
 437                                         sc->sched.channel_switch_time;
 438                         else
 439                                 avp->noa_duration =
 440                                         TU_TO_USEC(cur_conf->beacon_interval) / 2 +
 441                                         sc->sched.channel_switch_time;
 442
 443                         if (test_bit(ATH_OP_SCANNING, &common->op_flags) ||
 444                             sc->sched.extend_absence)
 445                                 avp->periodic_noa = false;
 446                         else
 447                                 avp->periodic_noa = true;
 448
 449                         ath_dbg(common, CHAN_CTX,
 450                                 "noa_duration: %d, noa_start: %d, noa_index: %d, periodic: %d\n",
 451                                 avp->noa_duration,
 452                                 avp->noa_start,
 453                                 avp->noa_index,
 454                                 avp->periodic_noa);
 455                 }
 456
 457                 if (ctx->active && sc->sched.force_noa_update)
 458                         sc->sched.force_noa_update = false;
 459
 460                 break;
 461         case ATH_CHANCTX_EVENT_BEACON_SENT:
 462                 if (!sc->sched.beacon_pending) {
 463                         ath_dbg(common, CHAN_CTX,
 464                                 "No pending beacon\n");
 465                         break;
 466                 }
 467
 468                 sc->sched.beacon_pending = false;
 469                 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
 470                         break;
 471
 472                 ath_dbg(common, CHAN_CTX,
 473                         "Move chanctx state to WAIT_FOR_TIMER\n");
 474
 475                 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
 476                 ath_chanctx_setup_timer(sc, sc->sched.switch_start_time);
 477                 break;
 478         case ATH_CHANCTX_EVENT_TSF_TIMER:
 479                 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER)
 480                         break;
 481
 482                 if (!sc->cur_chan->switch_after_beacon &&
 483                     sc->sched.beacon_pending)
 484                         sc->sched.beacon_miss++;
 485
 486                 ath_dbg(common, CHAN_CTX,
 487                         "Move chanctx state to SWITCH\n");
 488
 489                 sc->sched.state = ATH_CHANCTX_STATE_SWITCH;
 490                 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
 491                 break;
 492         case ATH_CHANCTX_EVENT_BEACON_RECEIVED:
 493                 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
 494                     sc->cur_chan == &sc->offchannel.chan)
 495                         break;
 496
 497                 ath_chanctx_adjust_tbtt_delta(sc);
 498                 sc->sched.beacon_pending = false;
 499                 sc->sched.beacon_miss = 0;
 500
 501                 /* TSF time might have been updated by the incoming beacon,
 502                  * need update the channel switch timer to reflect the change.
 503                  */
 504                 tsf_time = sc->sched.switch_start_time;
 505                 tsf_time -= (u32) sc->cur_chan->tsf_val +
 506                         ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
 507                 tsf_time += ath9k_hw_gettsf32(ah);
 508
 509
 510                 ath_chanctx_setup_timer(sc, tsf_time);
 511                 break;
 512         case ATH_CHANCTX_EVENT_ASSOC:
 513                 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
 514                     avp->chanctx != sc->cur_chan)
 515                         break;
 516
 517                 ath_dbg(common, CHAN_CTX,
 518                         "Move chanctx state from FORCE_ACTIVE to IDLE\n");
 519
 520                 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
 521                 /* fall through */
 522         case ATH_CHANCTX_EVENT_SWITCH:
 523                 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
 524                     sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
 525                     sc->cur_chan->switch_after_beacon ||
 526                     sc->cur_chan == &sc->offchannel.chan)
 527                         break;
 528
 529                 /* If this is a station chanctx, stay active for a half
 530                  * beacon period (minus channel switch time)
 531                  */
 532                 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
 533                 cur_conf = &sc->cur_chan->beacon;
 534
 535                 ath_dbg(common, CHAN_CTX,
 536                         "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
 537
 538                 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
 539                 sc->sched.wait_switch = false;
 540
 541                 tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
 542
 543                 if (sc->sched.extend_absence) {
 544                         sc->sched.beacon_miss = 0;
 545                         tsf_time *= 3;
 546                 }
 547
 548                 tsf_time -= sc->sched.channel_switch_time;
 549                 tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
 550                 sc->sched.switch_start_time = tsf_time;
 551
 552                 ath_chanctx_setup_timer(sc, tsf_time);
 553                 sc->sched.beacon_pending = true;
 554                 break;
 555         case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
 556                 if (sc->cur_chan == &sc->offchannel.chan ||
 557                     sc->cur_chan->switch_after_beacon)
 558                         break;
 559
 560                 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
 561                 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
 562                 break;
 563         case ATH_CHANCTX_EVENT_UNASSIGN:
 564                 if (sc->cur_chan->assigned) {
 565                         if (sc->next_chan && !sc->next_chan->assigned &&
 566                             sc->next_chan != &sc->offchannel.chan)
 567                                 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
 568                         break;
 569                 }
 570
 571                 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
 572                 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
 573                 if (!ctx->assigned)
 574                         break;
 575
 576                 sc->next_chan = ctx;
 577                 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
 578                 break;
 579         case ATH_CHANCTX_EVENT_ASSIGN:
 580                 /*
 581                  * When adding a new channel context, check if a scan
 582                  * is in progress and abort it since the addition of
 583                  * a new channel context is usually followed by VIF
 584                  * assignment, in which case we have to start multi-channel
 585                  * operation.
 586                  */
 587                 if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
 588                         ath_dbg(common, CHAN_CTX,
 589                                 "Aborting HW scan to add new context\n");
 590
 591                         spin_unlock_bh(&sc->chan_lock);
 592                         del_timer_sync(&sc->offchannel.timer);
 593                         ath_scan_complete(sc, true);
 594                         spin_lock_bh(&sc->chan_lock);
 595                 }
 596                 break;
 597         case ATH_CHANCTX_EVENT_CHANGE:
 598                 break;
 599         }
 600
 601         spin_unlock_bh(&sc->chan_lock);
 602 }
 603
 604 void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
 605                                 enum ath_chanctx_event ev)
 606 {
 607         if (sc->sched.beacon_pending)
 608                 ath_chanctx_event(sc, NULL, ev);
 609 }
 610
 611 void ath_chanctx_beacon_recv_ev(struct ath_softc *sc, u32 ts,
 612                                 enum ath_chanctx_event ev)
 613 {
 614         sc->sched.next_tbtt = ts;
 615         ath_chanctx_event(sc, NULL, ev);
 616 }
 617
 618 static int ath_scan_channel_duration(struct ath_softc *sc,
 619                                      struct ieee80211_channel *chan)
 620 {
 621         struct cfg80211_scan_request *req = sc->offchannel.scan_req;
 622
 623         if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
 624                 return (HZ / 9); /* ~110 ms */
 625
 626         return (HZ / 16); /* ~60 ms */
 627 }
 628
 629 static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
 630                                struct cfg80211_chan_def *chandef)
 631 {
 632         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 633
 634         spin_lock_bh(&sc->chan_lock);
 635
 636         if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
 637             (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
 638                 if (chandef)
 639                         ctx->chandef = *chandef;
 640
 641                 sc->sched.offchannel_pending = true;
 642                 sc->sched.wait_switch = true;
 643                 sc->sched.offchannel_duration =
 644                         jiffies_to_usecs(sc->offchannel.duration) +
 645                         sc->sched.channel_switch_time;
 646
 647                 spin_unlock_bh(&sc->chan_lock);
 648                 ath_dbg(common, CHAN_CTX,
 649                         "Set offchannel_pending to true\n");
 650                 return;
 651         }
 652
 653         sc->next_chan = ctx;
 654         if (chandef) {
 655                 ctx->chandef = *chandef;
 656                 ath_dbg(common, CHAN_CTX,
 657                         "Assigned next_chan to %d MHz\n", chandef->center_freq1);
 658         }
 659
 660         if (sc->next_chan == &sc->offchannel.chan) {
 661                 sc->sched.offchannel_duration =
 662                         jiffies_to_usecs(sc->offchannel.duration) +
 663                         sc->sched.channel_switch_time;
 664
 665                 if (chandef) {
 666                         ath_dbg(common, CHAN_CTX,
 667                                 "Offchannel duration for chan %d MHz : %u\n",
 668                                 chandef->center_freq1,
 669                                 sc->sched.offchannel_duration);
 670                 }
 671         }
 672         spin_unlock_bh(&sc->chan_lock);
 673         ieee80211_queue_work(sc->hw, &sc->chanctx_work);
 674 }
 675
 676 static void ath_chanctx_offchan_switch(struct ath_softc *sc,
 677                                        struct ieee80211_channel *chan)
 678 {
 679         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 680         struct cfg80211_chan_def chandef;
 681
 682         cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 683         ath_dbg(common, CHAN_CTX,
 684                 "Channel definition created: %d MHz\n", chandef.center_freq1);
 685
 686         ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
 687 }
 688
 689 static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
 690                                                      bool active)
 691 {
 692         struct ath_chanctx *ctx;
 693
 694         ath_for_each_chanctx(sc, ctx) {
 695                 if (!ctx->assigned || list_empty(&ctx->vifs))
 696                         continue;
 697                 if (active && !ctx->active)
 698                         continue;
 699
 700                 if (ctx->switch_after_beacon)
 701                         return ctx;
 702         }
 703
 704         return &sc->chanctx[0];
 705 }
 706
 707 static void
 708 ath_scan_next_channel(struct ath_softc *sc)
 709 {
 710         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 711         struct cfg80211_scan_request *req = sc->offchannel.scan_req;
 712         struct ieee80211_channel *chan;
 713
 714         if (sc->offchannel.scan_idx >= req->n_channels) {
 715                 ath_dbg(common, CHAN_CTX,
 716                         "Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
 717                         "scan_idx: %d, n_channels: %d\n",
 718                         sc->offchannel.scan_idx,
 719                         req->n_channels);
 720
 721                 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
 722                 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
 723                                    NULL);
 724                 return;
 725         }
 726
 727         ath_dbg(common, CHAN_CTX,
 728                 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
 729                 sc->offchannel.scan_idx);
 730
 731         chan = req->channels[sc->offchannel.scan_idx++];
 732         sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
 733         sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
 734
 735         ath_chanctx_offchan_switch(sc, chan);
 736 }
 737
 738 void ath_offchannel_next(struct ath_softc *sc)
 739 {
 740         struct ieee80211_vif *vif;
 741
 742         if (sc->offchannel.scan_req) {
 743                 vif = sc->offchannel.scan_vif;
 744                 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
 745                 ath_scan_next_channel(sc);
 746         } else if (sc->offchannel.roc_vif) {
 747                 vif = sc->offchannel.roc_vif;
 748                 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
 749                 sc->offchannel.duration =
 750                         msecs_to_jiffies(sc->offchannel.roc_duration);
 751                 sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
 752                 ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
 753         } else {
 754                 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
 755                                    NULL);
 756                 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
 757                 if (sc->ps_idle)
 758                         ath_cancel_work(sc);
 759         }
 760 }
 761
 762 void ath_roc_complete(struct ath_softc *sc, bool abort)
 763 {
 764         sc->offchannel.roc_vif = NULL;
 765         sc->offchannel.roc_chan = NULL;
 766         if (!abort)
 767                 ieee80211_remain_on_channel_expired(sc->hw);
 768         ath_offchannel_next(sc);
 769         ath9k_ps_restore(sc);
 770 }
 771
 772 void ath_scan_complete(struct ath_softc *sc, bool abort)
 773 {
 774         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 775
 776         if (abort)
 777                 ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
 778         else
 779                 ath_dbg(common, CHAN_CTX, "HW scan complete\n");
 780
 781         sc->offchannel.scan_req = NULL;
 782         sc->offchannel.scan_vif = NULL;
 783         sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
 784         ieee80211_scan_completed(sc->hw, abort);
 785         clear_bit(ATH_OP_SCANNING, &common->op_flags);
 786         spin_lock_bh(&sc->chan_lock);
 787         if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
 788                 sc->sched.force_noa_update = true;
 789         spin_unlock_bh(&sc->chan_lock);
 790         ath_offchannel_next(sc);
 791         ath9k_ps_restore(sc);
 792 }
 793
 794 static void ath_scan_send_probe(struct ath_softc *sc,
 795                                 struct cfg80211_ssid *ssid)
 796 {
 797         struct cfg80211_scan_request *req = sc->offchannel.scan_req;
 798         struct ieee80211_vif *vif = sc->offchannel.scan_vif;
 799         struct ath_tx_control txctl = {};
 800         struct sk_buff *skb;
 801         struct ieee80211_tx_info *info;
 802         int band = sc->offchannel.chan.chandef.chan->band;
 803
 804         skb = ieee80211_probereq_get(sc->hw, vif,
 805                         ssid->ssid, ssid->ssid_len, req->ie_len);
 806         if (!skb)
 807                 return;
 808
 809         info = IEEE80211_SKB_CB(skb);
 810         if (req->no_cck)
 811                 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 812
 813         if (req->ie_len)
 814                 memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
 815
 816         skb_set_queue_mapping(skb, IEEE80211_AC_VO);
 817
 818         if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
 819                 goto error;
 820
 821         txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 822         txctl.force_channel = true;
 823         if (ath_tx_start(sc->hw, skb, &txctl))
 824                 goto error;
 825
 826         return;
 827
 828 error:
 829         ieee80211_free_txskb(sc->hw, skb);
 830 }
 831
 832 static void ath_scan_channel_start(struct ath_softc *sc)
 833 {
 834         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 835         struct cfg80211_scan_request *req = sc->offchannel.scan_req;
 836         int i;
 837
 838         if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
 839             req->n_ssids) {
 840                 for (i = 0; i < req->n_ssids; i++)
 841                         ath_scan_send_probe(sc, &req->ssids[i]);
 842
 843         }
 844
 845         ath_dbg(common, CHAN_CTX,
 846                 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
 847
 848         sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
 849         mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
 850 }
 851
 852 static void ath_chanctx_timer(unsigned long data)
 853 {
 854         struct ath_softc *sc = (struct ath_softc *) data;
 855         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 856
 857         ath_dbg(common, CHAN_CTX,
 858                 "Channel context timer invoked\n");
 859
 860         ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
 861 }
 862
 863 static void ath_offchannel_timer(unsigned long data)
 864 {
 865         struct ath_softc *sc = (struct ath_softc *)data;
 866         struct ath_chanctx *ctx;
 867         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 868
 869         ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
 870                 __func__, offchannel_state_string(sc->offchannel.state));
 871
 872         switch (sc->offchannel.state) {
 873         case ATH_OFFCHANNEL_PROBE_WAIT:
 874                 if (!sc->offchannel.scan_req)
 875                         return;
 876
 877                 /* get first active channel context */
 878                 ctx = ath_chanctx_get_oper_chan(sc, true);
 879                 if (ctx->active) {
 880                         ath_dbg(common, CHAN_CTX,
 881                                 "Switch to oper/active context, "
 882                                 "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
 883
 884                         sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
 885                         ath_chanctx_switch(sc, ctx, NULL);
 886                         mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
 887                         break;
 888                 }
 889                 /* fall through */
 890         case ATH_OFFCHANNEL_SUSPEND:
 891                 if (!sc->offchannel.scan_req)
 892                         return;
 893
 894                 ath_scan_next_channel(sc);
 895                 break;
 896         case ATH_OFFCHANNEL_ROC_START:
 897         case ATH_OFFCHANNEL_ROC_WAIT:
 898                 ctx = ath_chanctx_get_oper_chan(sc, false);
 899                 sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
 900                 ath_chanctx_switch(sc, ctx, NULL);
 901                 break;
 902         default:
 903                 break;
 904         }
 905 }
 906
 907 static bool
 908 ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
 909                               bool powersave)
 910 {
 911         struct ieee80211_vif *vif = avp->vif;
 912         struct ieee80211_sta *sta = NULL;
 913         struct ieee80211_hdr_3addr *nullfunc;
 914         struct ath_tx_control txctl;
 915         struct sk_buff *skb;
 916         int band = sc->cur_chan->chandef.chan->band;
 917
 918         switch (vif->type) {
 919         case NL80211_IFTYPE_STATION:
 920                 if (!vif->bss_conf.assoc)
 921                         return false;
 922
 923                 skb = ieee80211_nullfunc_get(sc->hw, vif);
 924                 if (!skb)
 925                         return false;
 926
 927                 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 928                 if (powersave)
 929                         nullfunc->frame_control |=
 930                                 cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932                 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
 933                 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
 934                         dev_kfree_skb_any(skb);
 935                         return false;
 936                 }
 937                 break;
 938         default:
 939                 return false;
 940         }
 941
 942         memset(&txctl, 0, sizeof(txctl));
 943         txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 944         txctl.sta = sta;
 945         txctl.force_channel = true;
 946         if (ath_tx_start(sc->hw, skb, &txctl)) {
 947                 ieee80211_free_txskb(sc->hw, skb);
 948                 return false;
 949         }
 950
 951         return true;
 952 }
 953
 954 static bool
 955 ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
 956 {
 957         struct ath_vif *avp;
 958         bool sent = false;
 959
 960         rcu_read_lock();
 961         list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
 962                 if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
 963                         sent = true;
 964         }
 965         rcu_read_unlock();
 966
 967         return sent;
 968 }
 969
 970 static bool ath_chanctx_defer_switch(struct ath_softc *sc)
 971 {
 972         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 973
 974         if (sc->cur_chan == &sc->offchannel.chan)
 975                 return false;
 976
 977         switch (sc->sched.state) {
 978         case ATH_CHANCTX_STATE_SWITCH:
 979                 return false;
 980         case ATH_CHANCTX_STATE_IDLE:
 981                 if (!sc->cur_chan->switch_after_beacon)
 982                         return false;
 983
 984                 ath_dbg(common, CHAN_CTX,
 985                         "Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
 986
 987                 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
 988                 break;
 989         default:
 990                 break;
 991         }
 992
 993         return true;
 994 }
 995
 996 static void ath_offchannel_channel_change(struct ath_softc *sc)
 997 {
 998         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 999
1000         ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
1001                 __func__, offchannel_state_string(sc->offchannel.state));
1002
1003         switch (sc->offchannel.state) {
1004         case ATH_OFFCHANNEL_PROBE_SEND:
1005                 if (!sc->offchannel.scan_req)
1006                         return;
1007
1008                 if (sc->cur_chan->chandef.chan !=
1009                     sc->offchannel.chan.chandef.chan)
1010                         return;
1011
1012                 ath_scan_channel_start(sc);
1013                 break;
1014         case ATH_OFFCHANNEL_IDLE:
1015                 if (!sc->offchannel.scan_req)
1016                         return;
1017
1018                 ath_scan_complete(sc, false);
1019                 break;
1020         case ATH_OFFCHANNEL_ROC_START:
1021                 if (sc->cur_chan != &sc->offchannel.chan)
1022                         break;
1023
1024                 sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
1025                 mod_timer(&sc->offchannel.timer,
1026                           jiffies + sc->offchannel.duration);
1027                 ieee80211_ready_on_channel(sc->hw);
1028                 break;
1029         case ATH_OFFCHANNEL_ROC_DONE:
1030                 ath_roc_complete(sc, false);
1031                 break;
1032         default:
1033                 break;
1034         }
1035 }
1036
1037 void ath_chanctx_set_next(struct ath_softc *sc, bool force)
1038 {
1039         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1040         struct timespec ts;
1041         bool measure_time = false;
1042         bool send_ps = false;
1043
1044         spin_lock_bh(&sc->chan_lock);
1045         if (!sc->next_chan) {
1046                 spin_unlock_bh(&sc->chan_lock);
1047                 return;
1048         }
1049
1050         if (!force && ath_chanctx_defer_switch(sc)) {
1051                 spin_unlock_bh(&sc->chan_lock);
1052                 return;
1053         }
1054
1055         ath_dbg(common, CHAN_CTX,
1056                 "%s: current: %d MHz, next: %d MHz\n",
1057                 __func__,
1058                 sc->cur_chan->chandef.center_freq1,
1059                 sc->next_chan->chandef.center_freq1);
1060
1061         if (sc->cur_chan != sc->next_chan) {
1062                 ath_dbg(common, CHAN_CTX,
1063                         "Stopping current chanctx: %d\n",
1064                         sc->cur_chan->chandef.center_freq1);
1065                 sc->cur_chan->stopped = true;
1066                 spin_unlock_bh(&sc->chan_lock);
1067
1068                 if (sc->next_chan == &sc->offchannel.chan) {
1069                         getrawmonotonic(&ts);
1070                         measure_time = true;
1071                 }
1072                 __ath9k_flush(sc->hw, ~0, true);
1073
1074                 if (ath_chanctx_send_ps_frame(sc, true))
1075                         __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false);
1076
1077                 send_ps = true;
1078                 spin_lock_bh(&sc->chan_lock);
1079
1080                 if (sc->cur_chan != &sc->offchannel.chan) {
1081                         getrawmonotonic(&sc->cur_chan->tsf_ts);
1082                         sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
1083                 }
1084         }
1085         sc->cur_chan = sc->next_chan;
1086         sc->cur_chan->stopped = false;
1087         sc->next_chan = NULL;
1088
1089         if (!sc->sched.offchannel_pending)
1090                 sc->sched.offchannel_duration = 0;
1091
1092         if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
1093                 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
1094
1095         spin_unlock_bh(&sc->chan_lock);
1096
1097         if (sc->sc_ah->chip_fullsleep ||
1098             memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
1099                    sizeof(sc->cur_chandef))) {
1100                 ath_dbg(common, CHAN_CTX,
1101                         "%s: Set channel %d MHz\n",
1102                         __func__, sc->cur_chan->chandef.center_freq1);
1103                 ath_set_channel(sc);
1104                 if (measure_time)
1105                         sc->sched.channel_switch_time =
1106                                 ath9k_hw_get_tsf_offset(&ts, NULL);
1107         }
1108         if (send_ps)
1109                 ath_chanctx_send_ps_frame(sc, false);
1110
1111         ath_offchannel_channel_change(sc);
1112         ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
1113 }
1114
1115 static void ath_chanctx_work(struct work_struct *work)
1116 {
1117         struct ath_softc *sc = container_of(work, struct ath_softc,
1118                                             chanctx_work);
1119         mutex_lock(&sc->mutex);
1120         ath_chanctx_set_next(sc, false);
1121         mutex_unlock(&sc->mutex);
1122 }
1123
1124 void ath9k_offchannel_init(struct ath_softc *sc)
1125 {
1126         struct ath_chanctx *ctx;
1127         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1128         struct ieee80211_supported_band *sband;
1129         struct ieee80211_channel *chan;
1130         int i;
1131
1132         sband = &common->sbands[IEEE80211_BAND_2GHZ];
1133         if (!sband->n_channels)
1134                 sband = &common->sbands[IEEE80211_BAND_5GHZ];
1135
1136         chan = &sband->channels[0];
1137
1138         ctx = &sc->offchannel.chan;
1139         INIT_LIST_HEAD(&ctx->vifs);
1140         ctx->txpower = ATH_TXPOWER_MAX;
1141         cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
1142
1143         for (i = 0; i < ARRAY_SIZE(ctx->acq); i++)
1144                 INIT_LIST_HEAD(&ctx->acq[i]);
1145
1146         sc->offchannel.chan.offchannel = true;
1147 }
1148
1149 void ath9k_init_channel_context(struct ath_softc *sc)
1150 {
1151         INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
1152
1153         setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
1154                     (unsigned long)sc);
1155         setup_timer(&sc->sched.timer, ath_chanctx_timer,
1156                     (unsigned long)sc);
1157 }
1158
1159 void ath9k_deinit_channel_context(struct ath_softc *sc)
1160 {
1161         cancel_work_sync(&sc->chanctx_work);
1162 }
1163
1164 bool ath9k_is_chanctx_enabled(void)
1165 {
1166         return (ath9k_use_chanctx == 1);
1167 }
1168
1169 /********************/
1170 /* Queue management */
1171 /********************/
1172
1173 void ath9k_chanctx_wake_queues(struct ath_softc *sc)
1174 {
1175         struct ath_hw *ah = sc->sc_ah;
1176         int i;
1177
1178         if (sc->cur_chan == &sc->offchannel.chan) {
1179                 ieee80211_wake_queue(sc->hw,
1180                                      sc->hw->offchannel_tx_hw_queue);
1181         } else {
1182                 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1183                         ieee80211_wake_queue(sc->hw,
1184                                              sc->cur_chan->hw_queue_base + i);
1185         }
1186
1187         if (ah->opmode == NL80211_IFTYPE_AP)
1188                 ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
1189 }
1190
1191 /*****************/
1192 /* P2P Powersave */
1193 /*****************/
1194
1195 static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
1196 {
1197         struct ath_hw *ah = sc->sc_ah;
1198         s32 tsf, target_tsf;
1199
1200         if (!avp || !avp->noa.has_next_tsf)
1201                 return;
1202
1203         ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
1204
1205         tsf = ath9k_hw_gettsf32(sc->sc_ah);
1206
1207         target_tsf = avp->noa.next_tsf;
1208         if (!avp->noa.absent)
1209                 target_tsf -= ATH_P2P_PS_STOP_TIME;
1210
1211         if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
1212                 target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
1213
1214         ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, (u32) target_tsf, 1000000);
1215 }
1216
1217 static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
1218 {
1219         struct ath_vif *avp = (void *)vif->drv_priv;
1220         u32 tsf;
1221
1222         if (!sc->p2p_ps_timer)
1223                 return;
1224
1225         if (vif->type != NL80211_IFTYPE_STATION || !vif->p2p)
1226                 return;
1227
1228         sc->p2p_ps_vif = avp;
1229         tsf = ath9k_hw_gettsf32(sc->sc_ah);
1230         ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
1231         ath9k_update_p2p_ps_timer(sc, avp);
1232 }
1233
1234 static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
1235 {
1236         struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
1237         u8 switch_time, ctwin;
1238
1239         /*
1240          * Channel switch in multi-channel mode is deferred
1241          * by a quarter beacon interval when handling
1242          * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
1243          * interface is guaranteed to be discoverable
1244          * for that duration after a TBTT.
1245          */
1246         switch_time = cur_conf->beacon_interval / 4;
1247
1248         ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
1249         if (ctwin && (ctwin < switch_time))
1250                 return ctwin;
1251
1252         if (switch_time < P2P_DEFAULT_CTWIN)
1253                 return 0;
1254
1255         return P2P_DEFAULT_CTWIN;
1256 }
1257
1258 void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
1259                           struct sk_buff *skb)
1260 {
1261         static const u8 noa_ie_hdr[] = {
1262                 WLAN_EID_VENDOR_SPECIFIC,       /* type */
1263                 0,                              /* length */
1264                 0x50, 0x6f, 0x9a,               /* WFA OUI */
1265                 0x09,                           /* P2P subtype */
1266                 0x0c,                           /* Notice of Absence */
1267                 0x00,                           /* LSB of little-endian len */
1268                 0x00,                           /* MSB of little-endian len */
1269         };
1270
1271         struct ieee80211_p2p_noa_attr *noa;
1272         int noa_len, noa_desc, i = 0;
1273         u8 *hdr;
1274
1275         if (!avp->offchannel_duration && !avp->noa_duration)
1276                 return;
1277
1278         noa_desc = !!avp->offchannel_duration + !!avp->noa_duration;
1279         noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
1280
1281         hdr = skb_put(skb, sizeof(noa_ie_hdr));
1282         memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
1283         hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
1284         hdr[7] = noa_len;
1285
1286         noa = (void *) skb_put(skb, noa_len);
1287         memset(noa, 0, noa_len);
1288
1289         noa->index = avp->noa_index;
1290         noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
1291
1292         if (avp->noa_duration) {
1293                 if (avp->periodic_noa) {
1294                         u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
1295                         noa->desc[i].count = 255;
1296                         noa->desc[i].interval = cpu_to_le32(interval);
1297                 } else {
1298                         noa->desc[i].count = 1;
1299                 }
1300
1301                 noa->desc[i].start_time = cpu_to_le32(avp->noa_start);
1302                 noa->desc[i].duration = cpu_to_le32(avp->noa_duration);
1303                 i++;
1304         }
1305
1306         if (avp->offchannel_duration) {
1307                 noa->desc[i].count = 1;
1308                 noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
1309                 noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
1310         }
1311 }
1312
1313 void ath9k_p2p_ps_timer(void *priv)
1314 {
1315         struct ath_softc *sc = priv;
1316         struct ath_vif *avp = sc->p2p_ps_vif;
1317         struct ieee80211_vif *vif;
1318         struct ieee80211_sta *sta;
1319         struct ath_node *an;
1320         u32 tsf;
1321
1322         del_timer_sync(&sc->sched.timer);
1323         ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
1324         ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1325
1326         if (!avp || avp->chanctx != sc->cur_chan)
1327                 return;
1328
1329         tsf = ath9k_hw_gettsf32(sc->sc_ah);
1330         if (!avp->noa.absent)
1331                 tsf += ATH_P2P_PS_STOP_TIME;
1332
1333         if (!avp->noa.has_next_tsf ||
1334             avp->noa.next_tsf - tsf > BIT(31))
1335                 ieee80211_update_p2p_noa(&avp->noa, tsf);
1336
1337         ath9k_update_p2p_ps_timer(sc, avp);
1338
1339         rcu_read_lock();
1340
1341         vif = avp->vif;
1342         sta = ieee80211_find_sta(vif, vif->bss_conf.bssid);
1343         if (!sta)
1344                 goto out;
1345
1346         an = (void *) sta->drv_priv;
1347         if (an->sleeping == !!avp->noa.absent)
1348                 goto out;
1349
1350         an->sleeping = avp->noa.absent;
1351         if (an->sleeping)
1352                 ath_tx_aggr_sleep(sta, sc, an);
1353         else
1354                 ath_tx_aggr_wakeup(sc, an);
1355
1356 out:
1357         rcu_read_unlock();
1358 }
1359
1360 void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
1361                                 struct ieee80211_vif *vif)
1362 {
1363         unsigned long flags;
1364
1365         spin_lock_bh(&sc->sc_pcu_lock);
1366         spin_lock_irqsave(&sc->sc_pm_lock, flags);
1367         if (!(sc->ps_flags & PS_BEACON_SYNC))
1368                 ath9k_update_p2p_ps(sc, vif);
1369         spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1370         spin_unlock_bh(&sc->sc_pcu_lock);
1371 }
1372
1373 void ath9k_p2p_beacon_sync(struct ath_softc *sc)
1374 {
1375         if (sc->p2p_ps_vif)
1376                 ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
1377 }
1378
1379 void ath9k_p2p_remove_vif(struct ath_softc *sc,
1380                           struct ieee80211_vif *vif)
1381 {
1382         struct ath_vif *avp = (void *)vif->drv_priv;
1383
1384         spin_lock_bh(&sc->sc_pcu_lock);
1385         if (avp == sc->p2p_ps_vif) {
1386                 sc->p2p_ps_vif = NULL;
1387                 ath9k_update_p2p_ps_timer(sc, NULL);
1388         }
1389         spin_unlock_bh(&sc->sc_pcu_lock);
1390 }
1391
1392 int ath9k_init_p2p(struct ath_softc *sc)
1393 {
1394         sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
1395                                                NULL, sc, AR_FIRST_NDP_TIMER);
1396         if (!sc->p2p_ps_timer)
1397                 return -ENOMEM;
1398
1399         return 0;
1400 }
1401
1402 void ath9k_deinit_p2p(struct ath_softc *sc)
1403 {
1404         if (sc->p2p_ps_timer)
1405                 ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
1406 }
1407
1408 #endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */