linux/drivers/net/wireless/ath/ath9k/beacon.c
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   1/*
   2 * Copyright (c) 2008-2011 Atheros Communications 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 <linux/dma-mapping.h>
  18#include "ath9k.h"
  19
  20#define FUDGE 2
  21
  22static void ath9k_reset_beacon_status(struct ath_softc *sc)
  23{
  24        sc->beacon.tx_processed = false;
  25        sc->beacon.tx_last = false;
  26}
  27
  28/*
  29 *  This function will modify certain transmit queue properties depending on
  30 *  the operating mode of the station (AP or AdHoc).  Parameters are AIFS
  31 *  settings and channel width min/max
  32*/
  33static void ath9k_beaconq_config(struct ath_softc *sc)
  34{
  35        struct ath_hw *ah = sc->sc_ah;
  36        struct ath_common *common = ath9k_hw_common(ah);
  37        struct ath9k_tx_queue_info qi, qi_be;
  38        struct ath_txq *txq;
  39
  40        ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
  41
  42        if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
  43            sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
  44                /* Always burst out beacon and CAB traffic. */
  45                qi.tqi_aifs = 1;
  46                qi.tqi_cwmin = 0;
  47                qi.tqi_cwmax = 0;
  48        } else {
  49                /* Adhoc mode; important thing is to use 2x cwmin. */
  50                txq = sc->tx.txq_map[IEEE80211_AC_BE];
  51                ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
  52                qi.tqi_aifs = qi_be.tqi_aifs;
  53                if (ah->slottime == 20)
  54                        qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
  55                else
  56                        qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
  57                qi.tqi_cwmax = qi_be.tqi_cwmax;
  58        }
  59
  60        if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
  61                ath_err(common, "Unable to update h/w beacon queue parameters\n");
  62        } else {
  63                ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
  64        }
  65}
  66
  67/*
  68 *  Associates the beacon frame buffer with a transmit descriptor.  Will set
  69 *  up rate codes, and channel flags. Beacons are always sent out at the
  70 *  lowest rate, and are not retried.
  71*/
  72static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
  73                             struct ath_buf *bf, int rateidx)
  74{
  75        struct sk_buff *skb = bf->bf_mpdu;
  76        struct ath_hw *ah = sc->sc_ah;
  77        struct ath_common *common = ath9k_hw_common(ah);
  78        struct ath_tx_info info;
  79        struct ieee80211_supported_band *sband;
  80        u8 chainmask = ah->txchainmask;
  81        u8 i, rate = 0;
  82
  83        sband = &common->sbands[sc->cur_chandef.chan->band];
  84        rate = sband->bitrates[rateidx].hw_value;
  85        if (vif->bss_conf.use_short_preamble)
  86                rate |= sband->bitrates[rateidx].hw_value_short;
  87
  88        memset(&info, 0, sizeof(info));
  89        info.pkt_len = skb->len + FCS_LEN;
  90        info.type = ATH9K_PKT_TYPE_BEACON;
  91        for (i = 0; i < 4; i++)
  92                info.txpower[i] = MAX_RATE_POWER;
  93        info.keyix = ATH9K_TXKEYIX_INVALID;
  94        info.keytype = ATH9K_KEY_TYPE_CLEAR;
  95        info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
  96
  97        info.buf_addr[0] = bf->bf_buf_addr;
  98        info.buf_len[0] = roundup(skb->len, 4);
  99
 100        info.is_first = true;
 101        info.is_last = true;
 102
 103        info.qcu = sc->beacon.beaconq;
 104
 105        info.rates[0].Tries = 1;
 106        info.rates[0].Rate = rate;
 107        info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
 108
 109        ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
 110}
 111
 112static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
 113                                             struct ieee80211_vif *vif)
 114{
 115        struct ath_softc *sc = hw->priv;
 116        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 117        struct ath_buf *bf;
 118        struct ath_vif *avp = (void *)vif->drv_priv;
 119        struct sk_buff *skb;
 120        struct ath_txq *cabq = sc->beacon.cabq;
 121        struct ieee80211_tx_info *info;
 122        struct ieee80211_mgmt *mgmt_hdr;
 123        int cabq_depth;
 124
 125        if (avp->av_bcbuf == NULL)
 126                return NULL;
 127
 128        bf = avp->av_bcbuf;
 129        skb = bf->bf_mpdu;
 130        if (skb) {
 131                dma_unmap_single(sc->dev, bf->bf_buf_addr,
 132                                 skb->len, DMA_TO_DEVICE);
 133                dev_kfree_skb_any(skb);
 134                bf->bf_buf_addr = 0;
 135                bf->bf_mpdu = NULL;
 136        }
 137
 138        skb = ieee80211_beacon_get(hw, vif);
 139        if (skb == NULL)
 140                return NULL;
 141
 142        bf->bf_mpdu = skb;
 143
 144        mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
 145        mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
 146
 147        info = IEEE80211_SKB_CB(skb);
 148
 149        ath_assign_seq(common, skb);
 150
 151        /* Always assign NOA attr when MCC enabled */
 152        if (ath9k_is_chanctx_enabled())
 153                ath9k_beacon_add_noa(sc, avp, skb);
 154
 155        bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
 156                                         skb->len, DMA_TO_DEVICE);
 157        if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
 158                dev_kfree_skb_any(skb);
 159                bf->bf_mpdu = NULL;
 160                bf->bf_buf_addr = 0;
 161                ath_err(common, "dma_mapping_error on beaconing\n");
 162                return NULL;
 163        }
 164
 165        skb = ieee80211_get_buffered_bc(hw, vif);
 166
 167        /*
 168         * if the CABQ traffic from previous DTIM is pending and the current
 169         *  beacon is also a DTIM.
 170         *  1) if there is only one vif let the cab traffic continue.
 171         *  2) if there are more than one vif and we are using staggered
 172         *     beacons, then drain the cabq by dropping all the frames in
 173         *     the cabq so that the current vifs cab traffic can be scheduled.
 174         */
 175        spin_lock_bh(&cabq->axq_lock);
 176        cabq_depth = cabq->axq_depth;
 177        spin_unlock_bh(&cabq->axq_lock);
 178
 179        if (skb && cabq_depth) {
 180                if (sc->cur_chan->nvifs > 1) {
 181                        ath_dbg(common, BEACON,
 182                                "Flushing previous cabq traffic\n");
 183                        ath_draintxq(sc, cabq);
 184                }
 185        }
 186
 187        ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
 188
 189        if (skb)
 190                ath_tx_cabq(hw, vif, skb);
 191
 192        return bf;
 193}
 194
 195void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
 196{
 197        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 198        struct ath_vif *avp = (void *)vif->drv_priv;
 199        int slot;
 200
 201        avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
 202        list_del(&avp->av_bcbuf->list);
 203
 204        for (slot = 0; slot < ATH_BCBUF; slot++) {
 205                if (sc->beacon.bslot[slot] == NULL) {
 206                        avp->av_bslot = slot;
 207                        break;
 208                }
 209        }
 210
 211        sc->beacon.bslot[avp->av_bslot] = vif;
 212
 213        ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
 214                avp->av_bslot);
 215}
 216
 217void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
 218{
 219        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 220        struct ath_vif *avp = (void *)vif->drv_priv;
 221        struct ath_buf *bf = avp->av_bcbuf;
 222
 223        ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
 224                avp->av_bslot);
 225
 226        tasklet_disable(&sc->bcon_tasklet);
 227
 228        if (bf && bf->bf_mpdu) {
 229                struct sk_buff *skb = bf->bf_mpdu;
 230                dma_unmap_single(sc->dev, bf->bf_buf_addr,
 231                                 skb->len, DMA_TO_DEVICE);
 232                dev_kfree_skb_any(skb);
 233                bf->bf_mpdu = NULL;
 234                bf->bf_buf_addr = 0;
 235        }
 236
 237        avp->av_bcbuf = NULL;
 238        sc->beacon.bslot[avp->av_bslot] = NULL;
 239        list_add_tail(&bf->list, &sc->beacon.bbuf);
 240
 241        tasklet_enable(&sc->bcon_tasklet);
 242}
 243
 244void ath9k_beacon_ensure_primary_slot(struct ath_softc *sc)
 245{
 246        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 247        struct ieee80211_vif *vif;
 248        struct ath_vif *avp;
 249        s64 tsfadjust;
 250        u32 offset;
 251        int first_slot = ATH_BCBUF;
 252        int slot;
 253
 254        tasklet_disable(&sc->bcon_tasklet);
 255
 256        /* Find first taken slot. */
 257        for (slot = 0; slot < ATH_BCBUF; slot++) {
 258                if (sc->beacon.bslot[slot]) {
 259                        first_slot = slot;
 260                        break;
 261                }
 262        }
 263        if (first_slot == 0)
 264                goto out;
 265
 266        /* Re-enumarate all slots, moving them forward. */
 267        for (slot = 0; slot < ATH_BCBUF; slot++) {
 268                if (slot + first_slot < ATH_BCBUF) {
 269                        vif = sc->beacon.bslot[slot + first_slot];
 270                        sc->beacon.bslot[slot] = vif;
 271
 272                        if (vif) {
 273                                avp = (void *)vif->drv_priv;
 274                                avp->av_bslot = slot;
 275                        }
 276                } else {
 277                        sc->beacon.bslot[slot] = NULL;
 278                }
 279        }
 280
 281        vif = sc->beacon.bslot[0];
 282        if (WARN_ON(!vif))
 283                goto out;
 284
 285        /* Get the tsf_adjust value for the new first slot. */
 286        avp = (void *)vif->drv_priv;
 287        tsfadjust = le64_to_cpu(avp->tsf_adjust);
 288
 289        ath_dbg(common, CONFIG,
 290                "Adjusting global TSF after beacon slot reassignment: %lld\n",
 291                (signed long long)tsfadjust);
 292
 293        /* Modify TSF as required and update the HW. */
 294        avp->chanctx->tsf_val += tsfadjust;
 295        if (sc->cur_chan == avp->chanctx) {
 296                offset = ath9k_hw_get_tsf_offset(&avp->chanctx->tsf_ts, NULL);
 297                ath9k_hw_settsf64(sc->sc_ah, avp->chanctx->tsf_val + offset);
 298        }
 299
 300        /* The slots tsf_adjust will be updated by ath9k_beacon_config later. */
 301
 302out:
 303        tasklet_enable(&sc->bcon_tasklet);
 304}
 305
 306static int ath9k_beacon_choose_slot(struct ath_softc *sc)
 307{
 308        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 309        struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
 310        u16 intval;
 311        u32 tsftu;
 312        u64 tsf;
 313        int slot;
 314
 315        if (sc->sc_ah->opmode != NL80211_IFTYPE_AP &&
 316            sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) {
 317                ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
 318                        ath9k_hw_gettsf64(sc->sc_ah));
 319                return 0;
 320        }
 321
 322        intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
 323        tsf = ath9k_hw_gettsf64(sc->sc_ah);
 324        tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
 325        tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
 326        slot = (tsftu % (intval * ATH_BCBUF)) / intval;
 327
 328        ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
 329                slot, tsf, tsftu / ATH_BCBUF);
 330
 331        return slot;
 332}
 333
 334static void ath9k_set_tsfadjust(struct ath_softc *sc,
 335                                struct ath_beacon_config *cur_conf)
 336{
 337        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 338        s64 tsfadjust;
 339        int slot;
 340
 341        for (slot = 0; slot < ATH_BCBUF; slot++) {
 342                struct ath_vif *avp;
 343
 344                if (!sc->beacon.bslot[slot])
 345                        continue;
 346
 347                avp = (void *)sc->beacon.bslot[slot]->drv_priv;
 348
 349                /* tsf_adjust is added to the TSF value. We send out the
 350                 * beacon late, so need to adjust the TSF starting point to be
 351                 * later in time (i.e. the theoretical first beacon has a TSF
 352                 * of 0 after correction).
 353                 */
 354                tsfadjust = cur_conf->beacon_interval * avp->av_bslot;
 355                tsfadjust = -TU_TO_USEC(tsfadjust) / ATH_BCBUF;
 356                avp->tsf_adjust = cpu_to_le64(tsfadjust);
 357
 358                ath_dbg(common, CONFIG, "tsfadjust is: %lld for bslot: %d\n",
 359                        (signed long long)tsfadjust, avp->av_bslot);
 360        }
 361}
 362
 363bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
 364{
 365        if (!vif || !vif->csa_active)
 366                return false;
 367
 368        if (!ieee80211_csa_is_complete(vif))
 369                return false;
 370
 371        ieee80211_csa_finish(vif);
 372        return true;
 373}
 374
 375static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
 376{
 377        struct ath_softc *sc = data;
 378        ath9k_csa_is_finished(sc, vif);
 379}
 380
 381void ath9k_csa_update(struct ath_softc *sc)
 382{
 383        ieee80211_iterate_active_interfaces_atomic(sc->hw,
 384                                                   IEEE80211_IFACE_ITER_NORMAL,
 385                                                   ath9k_csa_update_vif, sc);
 386}
 387
 388void ath9k_beacon_tasklet(unsigned long data)
 389{
 390        struct ath_softc *sc = (struct ath_softc *)data;
 391        struct ath_hw *ah = sc->sc_ah;
 392        struct ath_common *common = ath9k_hw_common(ah);
 393        struct ath_buf *bf = NULL;
 394        struct ieee80211_vif *vif;
 395        bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
 396        int slot;
 397
 398        if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) {
 399                ath_dbg(common, RESET,
 400                        "reset work is pending, skip beaconing now\n");
 401                return;
 402        }
 403
 404        /*
 405         * Check if the previous beacon has gone out.  If
 406         * not don't try to post another, skip this period
 407         * and wait for the next.  Missed beacons indicate
 408         * a problem and should not occur.  If we miss too
 409         * many consecutive beacons reset the device.
 410         */
 411        if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
 412                sc->beacon.bmisscnt++;
 413
 414                ath9k_hw_check_nav(ah);
 415
 416                /*
 417                 * If the previous beacon has not been transmitted
 418                 * and a MAC/BB hang has been identified, return
 419                 * here because a chip reset would have been
 420                 * initiated.
 421                 */
 422                if (!ath_hw_check(sc))
 423                        return;
 424
 425                if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
 426                        ath_dbg(common, BSTUCK,
 427                                "missed %u consecutive beacons\n",
 428                                sc->beacon.bmisscnt);
 429                        ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
 430                        if (sc->beacon.bmisscnt > 3)
 431                                ath9k_hw_bstuck_nfcal(ah);
 432                } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
 433                        ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
 434                        sc->beacon.bmisscnt = 0;
 435                        ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
 436                }
 437
 438                return;
 439        }
 440
 441        slot = ath9k_beacon_choose_slot(sc);
 442        vif = sc->beacon.bslot[slot];
 443
 444        /* EDMA devices check that in the tx completion function. */
 445        if (!edma) {
 446                if (ath9k_is_chanctx_enabled()) {
 447                        ath_chanctx_beacon_sent_ev(sc,
 448                                          ATH_CHANCTX_EVENT_BEACON_SENT);
 449                }
 450
 451                if (ath9k_csa_is_finished(sc, vif))
 452                        return;
 453        }
 454
 455        if (!vif || !vif->bss_conf.enable_beacon)
 456                return;
 457
 458        if (ath9k_is_chanctx_enabled()) {
 459                ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE);
 460        }
 461
 462        bf = ath9k_beacon_generate(sc->hw, vif);
 463
 464        if (sc->beacon.bmisscnt != 0) {
 465                ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
 466                        sc->beacon.bmisscnt);
 467                sc->beacon.bmisscnt = 0;
 468        }
 469
 470        /*
 471         * Handle slot time change when a non-ERP station joins/leaves
 472         * an 11g network.  The 802.11 layer notifies us via callback,
 473         * we mark updateslot, then wait one beacon before effecting
 474         * the change.  This gives associated stations at least one
 475         * beacon interval to note the state change.
 476         *
 477         * NB: The slot time change state machine is clocked according
 478         *     to whether we are bursting or staggering beacons.  We
 479         *     recognize the request to update and record the current
 480         *     slot then don't transition until that slot is reached
 481         *     again.  If we miss a beacon for that slot then we'll be
 482         *     slow to transition but we'll be sure at least one beacon
 483         *     interval has passed.  When bursting slot is always left
 484         *     set to ATH_BCBUF so this check is a noop.
 485         */
 486        if (sc->beacon.updateslot == UPDATE) {
 487                sc->beacon.updateslot = COMMIT;
 488                sc->beacon.slotupdate = slot;
 489        } else if (sc->beacon.updateslot == COMMIT &&
 490                   sc->beacon.slotupdate == slot) {
 491                ah->slottime = sc->beacon.slottime;
 492                ath9k_hw_init_global_settings(ah);
 493                sc->beacon.updateslot = OK;
 494        }
 495
 496        if (bf) {
 497                ath9k_reset_beacon_status(sc);
 498
 499                ath_dbg(common, BEACON,
 500                        "Transmitting beacon for slot: %d\n", slot);
 501
 502                /* NB: cabq traffic should already be queued and primed */
 503                ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
 504
 505                if (!edma)
 506                        ath9k_hw_txstart(ah, sc->beacon.beaconq);
 507        }
 508}
 509
 510/*
 511 * Both nexttbtt and intval have to be in usecs.
 512 */
 513static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
 514                              u32 intval)
 515{
 516        struct ath_hw *ah = sc->sc_ah;
 517
 518        ath9k_hw_disable_interrupts(ah);
 519        ath9k_beaconq_config(sc);
 520        ath9k_hw_beaconinit(ah, nexttbtt, intval);
 521        ah->imask |= ATH9K_INT_SWBA;
 522        sc->beacon.bmisscnt = 0;
 523        ath9k_hw_set_interrupts(ah);
 524        ath9k_hw_enable_interrupts(ah);
 525}
 526
 527static void ath9k_beacon_stop(struct ath_softc *sc)
 528{
 529        ath9k_hw_disable_interrupts(sc->sc_ah);
 530        sc->sc_ah->imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);
 531        sc->beacon.bmisscnt = 0;
 532        ath9k_hw_set_interrupts(sc->sc_ah);
 533        ath9k_hw_enable_interrupts(sc->sc_ah);
 534}
 535
 536/*
 537 * For multi-bss ap support beacons are either staggered evenly over N slots or
 538 * burst together.  For the former arrange for the SWBA to be delivered for each
 539 * slot. Slots that are not occupied will generate nothing.
 540 */
 541static void ath9k_beacon_config_ap(struct ath_softc *sc,
 542                                   struct ath_beacon_config *conf)
 543{
 544        struct ath_hw *ah = sc->sc_ah;
 545
 546        ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
 547        ath9k_beacon_init(sc, conf->nexttbtt, conf->intval);
 548}
 549
 550static void ath9k_beacon_config_sta(struct ath_hw *ah,
 551                                    struct ath_beacon_config *conf)
 552{
 553        struct ath9k_beacon_state bs;
 554
 555        if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
 556                return;
 557
 558        ath9k_hw_disable_interrupts(ah);
 559        ath9k_hw_set_sta_beacon_timers(ah, &bs);
 560        ah->imask |= ATH9K_INT_BMISS;
 561
 562        ath9k_hw_set_interrupts(ah);
 563        ath9k_hw_enable_interrupts(ah);
 564}
 565
 566static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
 567                                      struct ath_beacon_config *conf)
 568{
 569        struct ath_hw *ah = sc->sc_ah;
 570        struct ath_common *common = ath9k_hw_common(ah);
 571
 572        ath9k_reset_beacon_status(sc);
 573
 574        ath9k_cmn_beacon_config_adhoc(ah, conf);
 575
 576        ath9k_beacon_init(sc, conf->nexttbtt, conf->intval);
 577
 578        /*
 579         * Set the global 'beacon has been configured' flag for the
 580         * joiner case in IBSS mode.
 581         */
 582        if (!conf->ibss_creator && conf->enable_beacon)
 583                set_bit(ATH_OP_BEACONS, &common->op_flags);
 584}
 585
 586static void ath9k_cache_beacon_config(struct ath_softc *sc,
 587                                      struct ath_chanctx *ctx,
 588                                      struct ieee80211_bss_conf *bss_conf)
 589{
 590        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 591        struct ath_beacon_config *cur_conf = &ctx->beacon;
 592
 593        ath_dbg(common, BEACON,
 594                "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
 595
 596        cur_conf->beacon_interval = bss_conf->beacon_int;
 597        cur_conf->dtim_period = bss_conf->dtim_period;
 598        cur_conf->dtim_count = 1;
 599        cur_conf->ibss_creator = bss_conf->ibss_creator;
 600
 601        /*
 602         * It looks like mac80211 may end up using beacon interval of zero in
 603         * some cases (at least for mesh point). Avoid getting into an
 604         * infinite loop by using a bit safer value instead. To be safe,
 605         * do sanity check on beacon interval for all operating modes.
 606         */
 607        if (cur_conf->beacon_interval == 0)
 608                cur_conf->beacon_interval = 100;
 609
 610        cur_conf->bmiss_timeout =
 611                ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
 612
 613        /*
 614         * We don't parse dtim period from mac80211 during the driver
 615         * initialization as it breaks association with hidden-ssid
 616         * AP and it causes latency in roaming
 617         */
 618        if (cur_conf->dtim_period == 0)
 619                cur_conf->dtim_period = 1;
 620
 621        ath9k_set_tsfadjust(sc, cur_conf);
 622}
 623
 624void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *main_vif,
 625                         bool beacons)
 626{
 627        struct ath_hw *ah = sc->sc_ah;
 628        struct ath_common *common = ath9k_hw_common(ah);
 629        struct ath_vif *avp;
 630        struct ath_chanctx *ctx;
 631        struct ath_beacon_config *cur_conf;
 632        unsigned long flags;
 633        bool enabled;
 634        bool skip_beacon = false;
 635
 636        if (!beacons) {
 637                clear_bit(ATH_OP_BEACONS, &common->op_flags);
 638                ath9k_beacon_stop(sc);
 639                return;
 640        }
 641
 642        if (WARN_ON(!main_vif))
 643                return;
 644
 645        avp = (void *)main_vif->drv_priv;
 646        ctx = avp->chanctx;
 647        cur_conf = &ctx->beacon;
 648        enabled = cur_conf->enable_beacon;
 649        cur_conf->enable_beacon = beacons;
 650
 651        if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
 652                ath9k_cache_beacon_config(sc, ctx, &main_vif->bss_conf);
 653
 654                ath9k_set_beacon(sc);
 655                set_bit(ATH_OP_BEACONS, &common->op_flags);
 656                return;
 657        }
 658
 659        /* Update the beacon configuration. */
 660        ath9k_cache_beacon_config(sc, ctx, &main_vif->bss_conf);
 661
 662        /*
 663         * Configure the HW beacon registers only when we have a valid
 664         * beacon interval.
 665         */
 666        if (cur_conf->beacon_interval) {
 667                /* Special case to sync the TSF when joining an existing IBSS.
 668                 * This is only done if no AP interface is active.
 669                 * Note that mac80211 always resets the TSF when creating a new
 670                 * IBSS interface.
 671                 */
 672                if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC &&
 673                    !enabled && beacons && !main_vif->bss_conf.ibss_creator) {
 674                        spin_lock_irqsave(&sc->sc_pm_lock, flags);
 675                        sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
 676                        spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 677                        skip_beacon = true;
 678                }
 679
 680                /*
 681                 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
 682                 * here, it is done in ath9k_beacon_config_adhoc().
 683                 */
 684                if (beacons && !skip_beacon) {
 685                        set_bit(ATH_OP_BEACONS, &common->op_flags);
 686                        ath9k_set_beacon(sc);
 687                } else {
 688                        clear_bit(ATH_OP_BEACONS, &common->op_flags);
 689                        ath9k_beacon_stop(sc);
 690                }
 691        } else {
 692                clear_bit(ATH_OP_BEACONS, &common->op_flags);
 693                ath9k_beacon_stop(sc);
 694        }
 695}
 696
 697void ath9k_set_beacon(struct ath_softc *sc)
 698{
 699        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 700        struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
 701
 702        switch (sc->sc_ah->opmode) {
 703        case NL80211_IFTYPE_AP:
 704        case NL80211_IFTYPE_MESH_POINT:
 705                ath9k_beacon_config_ap(sc, cur_conf);
 706                break;
 707        case NL80211_IFTYPE_ADHOC:
 708                ath9k_beacon_config_adhoc(sc, cur_conf);
 709                break;
 710        case NL80211_IFTYPE_STATION:
 711                ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
 712                break;
 713        default:
 714                ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
 715                return;
 716        }
 717}
 718