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 22 static 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 */ 33 static 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 == ATH9K_SLOT_TIME_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 */ 72 static 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 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 info.txpower = MAX_RATE_POWER; 92 info.keyix = ATH9K_TXKEYIX_INVALID; 93 info.keytype = ATH9K_KEY_TYPE_CLEAR; 94 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK; 95 96 info.buf_addr[0] = bf->bf_buf_addr; 97 info.buf_len[0] = roundup(skb->len, 4); 98 99 info.is_first = true; 100 info.is_last = true; 101 102 info.qcu = sc->beacon.beaconq; 103 104 info.rates[0].Tries = 1; 105 info.rates[0].Rate = rate; 106 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate); 107 108 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info); 109 } 110 111 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw, 112 struct ieee80211_vif *vif) 113 { 114 struct ath_softc *sc = hw->priv; 115 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 116 struct ath_buf *bf; 117 struct ath_vif *avp = (void *)vif->drv_priv; 118 struct sk_buff *skb; 119 struct ath_txq *cabq = sc->beacon.cabq; 120 struct ieee80211_tx_info *info; 121 struct ieee80211_mgmt *mgmt_hdr; 122 int cabq_depth; 123 124 if (avp->av_bcbuf == NULL) 125 return NULL; 126 127 bf = avp->av_bcbuf; 128 skb = bf->bf_mpdu; 129 if (skb) { 130 dma_unmap_single(sc->dev, bf->bf_buf_addr, 131 skb->len, DMA_TO_DEVICE); 132 dev_kfree_skb_any(skb); 133 bf->bf_buf_addr = 0; 134 bf->bf_mpdu = NULL; 135 } 136 137 skb = ieee80211_beacon_get(hw, vif); 138 if (skb == NULL) 139 return NULL; 140 141 bf->bf_mpdu = skb; 142 143 mgmt_hdr = (struct ieee80211_mgmt *)skb->data; 144 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust; 145 146 info = IEEE80211_SKB_CB(skb); 147 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { 148 /* 149 * TODO: make sure the seq# gets assigned properly (vs. other 150 * TX frames) 151 */ 152 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 153 sc->tx.seq_no += 0x10; 154 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 155 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); 156 } 157 158 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 159 skb->len, DMA_TO_DEVICE); 160 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 161 dev_kfree_skb_any(skb); 162 bf->bf_mpdu = NULL; 163 bf->bf_buf_addr = 0; 164 ath_err(common, "dma_mapping_error on beaconing\n"); 165 return NULL; 166 } 167 168 skb = ieee80211_get_buffered_bc(hw, vif); 169 170 /* 171 * if the CABQ traffic from previous DTIM is pending and the current 172 * beacon is also a DTIM. 173 * 1) if there is only one vif let the cab traffic continue. 174 * 2) if there are more than one vif and we are using staggered 175 * beacons, then drain the cabq by dropping all the frames in 176 * the cabq so that the current vifs cab traffic can be scheduled. 177 */ 178 spin_lock_bh(&cabq->axq_lock); 179 cabq_depth = cabq->axq_depth; 180 spin_unlock_bh(&cabq->axq_lock); 181 182 if (skb && cabq_depth) { 183 if (sc->nvifs > 1) { 184 ath_dbg(common, BEACON, 185 "Flushing previous cabq traffic\n"); 186 ath_draintxq(sc, cabq); 187 } 188 } 189 190 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); 191 192 if (skb) 193 ath_tx_cabq(hw, vif, skb); 194 195 return bf; 196 } 197 198 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 199 { 200 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 201 struct ath_vif *avp = (void *)vif->drv_priv; 202 int slot; 203 204 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); 205 list_del(&avp->av_bcbuf->list); 206 207 for (slot = 0; slot < ATH_BCBUF; slot++) { 208 if (sc->beacon.bslot[slot] == NULL) { 209 avp->av_bslot = slot; 210 break; 211 } 212 } 213 214 sc->beacon.bslot[avp->av_bslot] = vif; 215 sc->nbcnvifs++; 216 217 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", 218 avp->av_bslot); 219 } 220 221 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 222 { 223 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 224 struct ath_vif *avp = (void *)vif->drv_priv; 225 struct ath_buf *bf = avp->av_bcbuf; 226 227 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", 228 avp->av_bslot); 229 230 tasklet_disable(&sc->bcon_tasklet); 231 232 if (bf && bf->bf_mpdu) { 233 struct sk_buff *skb = bf->bf_mpdu; 234 dma_unmap_single(sc->dev, bf->bf_buf_addr, 235 skb->len, DMA_TO_DEVICE); 236 dev_kfree_skb_any(skb); 237 bf->bf_mpdu = NULL; 238 bf->bf_buf_addr = 0; 239 } 240 241 avp->av_bcbuf = NULL; 242 sc->beacon.bslot[avp->av_bslot] = NULL; 243 sc->nbcnvifs--; 244 list_add_tail(&bf->list, &sc->beacon.bbuf); 245 246 tasklet_enable(&sc->bcon_tasklet); 247 } 248 249 static int ath9k_beacon_choose_slot(struct ath_softc *sc) 250 { 251 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 252 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 253 u16 intval; 254 u32 tsftu; 255 u64 tsf; 256 int slot; 257 258 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP && 259 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) { 260 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", 261 ath9k_hw_gettsf64(sc->sc_ah)); 262 return 0; 263 } 264 265 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; 266 tsf = ath9k_hw_gettsf64(sc->sc_ah); 267 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); 268 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); 269 slot = (tsftu % (intval * ATH_BCBUF)) / intval; 270 271 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", 272 slot, tsf, tsftu / ATH_BCBUF); 273 274 return slot; 275 } 276 277 static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) 278 { 279 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 280 struct ath_vif *avp = (void *)vif->drv_priv; 281 struct ath_beacon_config *cur_conf = &avp->chanctx->beacon; 282 u32 tsfadjust; 283 284 if (avp->av_bslot == 0) 285 return; 286 287 tsfadjust = cur_conf->beacon_interval * avp->av_bslot; 288 tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF; 289 avp->tsf_adjust = cpu_to_le64(tsfadjust); 290 291 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", 292 (unsigned long long)tsfadjust, avp->av_bslot); 293 } 294 295 bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif) 296 { 297 if (!vif || !vif->csa_active) 298 return false; 299 300 if (!ieee80211_csa_is_complete(vif)) 301 return false; 302 303 ieee80211_csa_finish(vif); 304 return true; 305 } 306 307 static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif) 308 { 309 struct ath_softc *sc = data; 310 ath9k_csa_is_finished(sc, vif); 311 } 312 313 void ath9k_csa_update(struct ath_softc *sc) 314 { 315 ieee80211_iterate_active_interfaces_atomic(sc->hw, 316 IEEE80211_IFACE_ITER_NORMAL, 317 ath9k_csa_update_vif, sc); 318 } 319 320 void ath9k_beacon_tasklet(unsigned long data) 321 { 322 struct ath_softc *sc = (struct ath_softc *)data; 323 struct ath_hw *ah = sc->sc_ah; 324 struct ath_common *common = ath9k_hw_common(ah); 325 struct ath_buf *bf = NULL; 326 struct ieee80211_vif *vif; 327 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 328 int slot; 329 330 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) { 331 ath_dbg(common, RESET, 332 "reset work is pending, skip beaconing now\n"); 333 return; 334 } 335 336 /* 337 * Check if the previous beacon has gone out. If 338 * not don't try to post another, skip this period 339 * and wait for the next. Missed beacons indicate 340 * a problem and should not occur. If we miss too 341 * many consecutive beacons reset the device. 342 */ 343 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 344 sc->beacon.bmisscnt++; 345 346 ath9k_hw_check_nav(ah); 347 348 /* 349 * If the previous beacon has not been transmitted 350 * and a MAC/BB hang has been identified, return 351 * here because a chip reset would have been 352 * initiated. 353 */ 354 if (!ath_hw_check(sc)) 355 return; 356 357 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 358 ath_dbg(common, BSTUCK, 359 "missed %u consecutive beacons\n", 360 sc->beacon.bmisscnt); 361 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 362 if (sc->beacon.bmisscnt > 3) 363 ath9k_hw_bstuck_nfcal(ah); 364 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 365 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 366 sc->beacon.bmisscnt = 0; 367 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 368 } 369 370 return; 371 } 372 373 slot = ath9k_beacon_choose_slot(sc); 374 vif = sc->beacon.bslot[slot]; 375 376 /* EDMA devices check that in the tx completion function. */ 377 if (!edma) { 378 if (sc->sched.beacon_pending) 379 ath_chanctx_event(sc, NULL, 380 ATH_CHANCTX_EVENT_BEACON_SENT); 381 382 if (ath9k_csa_is_finished(sc, vif)) 383 return; 384 } 385 386 if (!vif || !vif->bss_conf.enable_beacon) 387 return; 388 389 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE); 390 bf = ath9k_beacon_generate(sc->hw, vif); 391 392 if (sc->beacon.bmisscnt != 0) { 393 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 394 sc->beacon.bmisscnt); 395 sc->beacon.bmisscnt = 0; 396 } 397 398 /* 399 * Handle slot time change when a non-ERP station joins/leaves 400 * an 11g network. The 802.11 layer notifies us via callback, 401 * we mark updateslot, then wait one beacon before effecting 402 * the change. This gives associated stations at least one 403 * beacon interval to note the state change. 404 * 405 * NB: The slot time change state machine is clocked according 406 * to whether we are bursting or staggering beacons. We 407 * recognize the request to update and record the current 408 * slot then don't transition until that slot is reached 409 * again. If we miss a beacon for that slot then we'll be 410 * slow to transition but we'll be sure at least one beacon 411 * interval has passed. When bursting slot is always left 412 * set to ATH_BCBUF so this check is a noop. 413 */ 414 if (sc->beacon.updateslot == UPDATE) { 415 sc->beacon.updateslot = COMMIT; 416 sc->beacon.slotupdate = slot; 417 } else if (sc->beacon.updateslot == COMMIT && 418 sc->beacon.slotupdate == slot) { 419 ah->slottime = sc->beacon.slottime; 420 ath9k_hw_init_global_settings(ah); 421 sc->beacon.updateslot = OK; 422 } 423 424 if (bf) { 425 ath9k_reset_beacon_status(sc); 426 427 ath_dbg(common, BEACON, 428 "Transmitting beacon for slot: %d\n", slot); 429 430 /* NB: cabq traffic should already be queued and primed */ 431 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 432 433 if (!edma) 434 ath9k_hw_txstart(ah, sc->beacon.beaconq); 435 } 436 } 437 438 /* 439 * Both nexttbtt and intval have to be in usecs. 440 */ 441 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 442 u32 intval, bool reset_tsf) 443 { 444 struct ath_hw *ah = sc->sc_ah; 445 446 ath9k_hw_disable_interrupts(ah); 447 if (reset_tsf) 448 ath9k_hw_reset_tsf(ah); 449 ath9k_beaconq_config(sc); 450 ath9k_hw_beaconinit(ah, nexttbtt, intval); 451 sc->beacon.bmisscnt = 0; 452 ath9k_hw_set_interrupts(ah); 453 ath9k_hw_enable_interrupts(ah); 454 } 455 456 /* 457 * For multi-bss ap support beacons are either staggered evenly over N slots or 458 * burst together. For the former arrange for the SWBA to be delivered for each 459 * slot. Slots that are not occupied will generate nothing. 460 */ 461 static void ath9k_beacon_config_ap(struct ath_softc *sc, 462 struct ath_beacon_config *conf) 463 { 464 struct ath_hw *ah = sc->sc_ah; 465 466 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF); 467 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false); 468 } 469 470 static void ath9k_beacon_config_sta(struct ath_hw *ah, 471 struct ath_beacon_config *conf) 472 { 473 struct ath9k_beacon_state bs; 474 475 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM) 476 return; 477 478 ath9k_hw_disable_interrupts(ah); 479 ath9k_hw_set_sta_beacon_timers(ah, &bs); 480 ah->imask |= ATH9K_INT_BMISS; 481 482 ath9k_hw_set_interrupts(ah); 483 ath9k_hw_enable_interrupts(ah); 484 } 485 486 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 487 struct ath_beacon_config *conf) 488 { 489 struct ath_hw *ah = sc->sc_ah; 490 struct ath_common *common = ath9k_hw_common(ah); 491 492 ath9k_reset_beacon_status(sc); 493 494 ath9k_cmn_beacon_config_adhoc(ah, conf); 495 496 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator); 497 498 /* 499 * Set the global 'beacon has been configured' flag for the 500 * joiner case in IBSS mode. 501 */ 502 if (!conf->ibss_creator && conf->enable_beacon) 503 set_bit(ATH_OP_BEACONS, &common->op_flags); 504 } 505 506 static bool ath9k_allow_beacon_config(struct ath_softc *sc, 507 struct ieee80211_vif *vif) 508 { 509 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 510 511 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 512 if ((vif->type != NL80211_IFTYPE_AP) || 513 (sc->nbcnvifs > 1)) { 514 ath_dbg(common, CONFIG, 515 "An AP interface is already present !\n"); 516 return false; 517 } 518 } 519 520 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 521 if ((vif->type == NL80211_IFTYPE_STATION) && 522 test_bit(ATH_OP_BEACONS, &common->op_flags) && 523 vif != sc->cur_chan->primary_sta) { 524 ath_dbg(common, CONFIG, 525 "Beacon already configured for a station interface\n"); 526 return false; 527 } 528 } 529 530 return true; 531 } 532 533 static void ath9k_cache_beacon_config(struct ath_softc *sc, 534 struct ath_chanctx *ctx, 535 struct ieee80211_bss_conf *bss_conf) 536 { 537 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 538 struct ath_beacon_config *cur_conf = &ctx->beacon; 539 540 ath_dbg(common, BEACON, 541 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 542 543 cur_conf->beacon_interval = bss_conf->beacon_int; 544 cur_conf->dtim_period = bss_conf->dtim_period; 545 cur_conf->dtim_count = 1; 546 cur_conf->ibss_creator = bss_conf->ibss_creator; 547 548 /* 549 * It looks like mac80211 may end up using beacon interval of zero in 550 * some cases (at least for mesh point). Avoid getting into an 551 * infinite loop by using a bit safer value instead. To be safe, 552 * do sanity check on beacon interval for all operating modes. 553 */ 554 if (cur_conf->beacon_interval == 0) 555 cur_conf->beacon_interval = 100; 556 557 cur_conf->bmiss_timeout = 558 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 559 560 /* 561 * We don't parse dtim period from mac80211 during the driver 562 * initialization as it breaks association with hidden-ssid 563 * AP and it causes latency in roaming 564 */ 565 if (cur_conf->dtim_period == 0) 566 cur_conf->dtim_period = 1; 567 568 } 569 570 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 571 u32 changed) 572 { 573 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 574 struct ath_hw *ah = sc->sc_ah; 575 struct ath_common *common = ath9k_hw_common(ah); 576 struct ath_vif *avp = (void *)vif->drv_priv; 577 struct ath_chanctx *ctx = avp->chanctx; 578 struct ath_beacon_config *cur_conf; 579 unsigned long flags; 580 bool skip_beacon = false; 581 582 if (!ctx) 583 return; 584 585 cur_conf = &avp->chanctx->beacon; 586 if (vif->type == NL80211_IFTYPE_AP) 587 ath9k_set_tsfadjust(sc, vif); 588 589 if (!ath9k_allow_beacon_config(sc, vif)) 590 return; 591 592 if (vif->type == NL80211_IFTYPE_STATION) { 593 ath9k_cache_beacon_config(sc, ctx, bss_conf); 594 if (ctx != sc->cur_chan) 595 return; 596 597 ath9k_set_beacon(sc); 598 set_bit(ATH_OP_BEACONS, &common->op_flags); 599 return; 600 } 601 602 /* 603 * Take care of multiple interfaces when 604 * enabling/disabling SWBA. 605 */ 606 if (changed & BSS_CHANGED_BEACON_ENABLED) { 607 if (!bss_conf->enable_beacon && 608 (sc->nbcnvifs <= 1)) { 609 cur_conf->enable_beacon = false; 610 } else if (bss_conf->enable_beacon) { 611 cur_conf->enable_beacon = true; 612 ath9k_cache_beacon_config(sc, ctx, bss_conf); 613 } 614 } 615 616 if (ctx != sc->cur_chan) 617 return; 618 619 /* 620 * Configure the HW beacon registers only when we have a valid 621 * beacon interval. 622 */ 623 if (cur_conf->beacon_interval) { 624 /* 625 * If we are joining an existing IBSS network, start beaconing 626 * only after a TSF-sync has taken place. Ensure that this 627 * happens by setting the appropriate flags. 628 */ 629 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 630 bss_conf->enable_beacon) { 631 spin_lock_irqsave(&sc->sc_pm_lock, flags); 632 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 633 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 634 skip_beacon = true; 635 } else { 636 ath9k_set_beacon(sc); 637 } 638 639 /* 640 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode 641 * here, it is done in ath9k_beacon_config_adhoc(). 642 */ 643 if (cur_conf->enable_beacon && !skip_beacon) 644 set_bit(ATH_OP_BEACONS, &common->op_flags); 645 else 646 clear_bit(ATH_OP_BEACONS, &common->op_flags); 647 } 648 } 649 650 void ath9k_set_beacon(struct ath_softc *sc) 651 { 652 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 653 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 654 655 switch (sc->sc_ah->opmode) { 656 case NL80211_IFTYPE_AP: 657 case NL80211_IFTYPE_MESH_POINT: 658 ath9k_beacon_config_ap(sc, cur_conf); 659 break; 660 case NL80211_IFTYPE_ADHOC: 661 ath9k_beacon_config_adhoc(sc, cur_conf); 662 break; 663 case NL80211_IFTYPE_STATION: 664 ath9k_beacon_config_sta(sc->sc_ah, cur_conf); 665 break; 666 default: 667 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 668 return; 669 } 670 } 671