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); 147 148 ath_assign_seq(common, skb); 149 150 if (vif->p2p) 151 ath9k_beacon_add_noa(sc, avp, skb); 152 153 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 154 skb->len, DMA_TO_DEVICE); 155 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 156 dev_kfree_skb_any(skb); 157 bf->bf_mpdu = NULL; 158 bf->bf_buf_addr = 0; 159 ath_err(common, "dma_mapping_error on beaconing\n"); 160 return NULL; 161 } 162 163 skb = ieee80211_get_buffered_bc(hw, vif); 164 165 /* 166 * if the CABQ traffic from previous DTIM is pending and the current 167 * beacon is also a DTIM. 168 * 1) if there is only one vif let the cab traffic continue. 169 * 2) if there are more than one vif and we are using staggered 170 * beacons, then drain the cabq by dropping all the frames in 171 * the cabq so that the current vifs cab traffic can be scheduled. 172 */ 173 spin_lock_bh(&cabq->axq_lock); 174 cabq_depth = cabq->axq_depth; 175 spin_unlock_bh(&cabq->axq_lock); 176 177 if (skb && cabq_depth) { 178 if (sc->cur_chan->nvifs > 1) { 179 ath_dbg(common, BEACON, 180 "Flushing previous cabq traffic\n"); 181 ath_draintxq(sc, cabq); 182 } 183 } 184 185 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); 186 187 if (skb) 188 ath_tx_cabq(hw, vif, skb); 189 190 return bf; 191 } 192 193 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 194 { 195 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 196 struct ath_vif *avp = (void *)vif->drv_priv; 197 int slot; 198 199 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); 200 list_del(&avp->av_bcbuf->list); 201 202 for (slot = 0; slot < ATH_BCBUF; slot++) { 203 if (sc->beacon.bslot[slot] == NULL) { 204 avp->av_bslot = slot; 205 break; 206 } 207 } 208 209 sc->beacon.bslot[avp->av_bslot] = vif; 210 sc->nbcnvifs++; 211 212 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", 213 avp->av_bslot); 214 } 215 216 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 217 { 218 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 219 struct ath_vif *avp = (void *)vif->drv_priv; 220 struct ath_buf *bf = avp->av_bcbuf; 221 222 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", 223 avp->av_bslot); 224 225 tasklet_disable(&sc->bcon_tasklet); 226 227 if (bf && bf->bf_mpdu) { 228 struct sk_buff *skb = bf->bf_mpdu; 229 dma_unmap_single(sc->dev, bf->bf_buf_addr, 230 skb->len, DMA_TO_DEVICE); 231 dev_kfree_skb_any(skb); 232 bf->bf_mpdu = NULL; 233 bf->bf_buf_addr = 0; 234 } 235 236 avp->av_bcbuf = NULL; 237 sc->beacon.bslot[avp->av_bslot] = NULL; 238 sc->nbcnvifs--; 239 list_add_tail(&bf->list, &sc->beacon.bbuf); 240 241 tasklet_enable(&sc->bcon_tasklet); 242 } 243 244 static int ath9k_beacon_choose_slot(struct ath_softc *sc) 245 { 246 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 247 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 248 u16 intval; 249 u32 tsftu; 250 u64 tsf; 251 int slot; 252 253 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP && 254 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) { 255 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", 256 ath9k_hw_gettsf64(sc->sc_ah)); 257 return 0; 258 } 259 260 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; 261 tsf = ath9k_hw_gettsf64(sc->sc_ah); 262 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); 263 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); 264 slot = (tsftu % (intval * ATH_BCBUF)) / intval; 265 266 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", 267 slot, tsf, tsftu / ATH_BCBUF); 268 269 return slot; 270 } 271 272 static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) 273 { 274 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 275 struct ath_vif *avp = (void *)vif->drv_priv; 276 struct ath_beacon_config *cur_conf = &avp->chanctx->beacon; 277 u32 tsfadjust; 278 279 if (avp->av_bslot == 0) 280 return; 281 282 tsfadjust = cur_conf->beacon_interval * avp->av_bslot; 283 tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF; 284 avp->tsf_adjust = cpu_to_le64(tsfadjust); 285 286 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", 287 (unsigned long long)tsfadjust, avp->av_bslot); 288 } 289 290 bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif) 291 { 292 if (!vif || !vif->csa_active) 293 return false; 294 295 if (!ieee80211_csa_is_complete(vif)) 296 return false; 297 298 ieee80211_csa_finish(vif); 299 return true; 300 } 301 302 static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif) 303 { 304 struct ath_softc *sc = data; 305 ath9k_csa_is_finished(sc, vif); 306 } 307 308 void ath9k_csa_update(struct ath_softc *sc) 309 { 310 ieee80211_iterate_active_interfaces_atomic(sc->hw, 311 IEEE80211_IFACE_ITER_NORMAL, 312 ath9k_csa_update_vif, sc); 313 } 314 315 void ath9k_beacon_tasklet(unsigned long data) 316 { 317 struct ath_softc *sc = (struct ath_softc *)data; 318 struct ath_hw *ah = sc->sc_ah; 319 struct ath_common *common = ath9k_hw_common(ah); 320 struct ath_buf *bf = NULL; 321 struct ieee80211_vif *vif; 322 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 323 int slot; 324 325 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) { 326 ath_dbg(common, RESET, 327 "reset work is pending, skip beaconing now\n"); 328 return; 329 } 330 331 /* 332 * Check if the previous beacon has gone out. If 333 * not don't try to post another, skip this period 334 * and wait for the next. Missed beacons indicate 335 * a problem and should not occur. If we miss too 336 * many consecutive beacons reset the device. 337 */ 338 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 339 sc->beacon.bmisscnt++; 340 341 ath9k_hw_check_nav(ah); 342 343 /* 344 * If the previous beacon has not been transmitted 345 * and a MAC/BB hang has been identified, return 346 * here because a chip reset would have been 347 * initiated. 348 */ 349 if (!ath_hw_check(sc)) 350 return; 351 352 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 353 ath_dbg(common, BSTUCK, 354 "missed %u consecutive beacons\n", 355 sc->beacon.bmisscnt); 356 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 357 if (sc->beacon.bmisscnt > 3) 358 ath9k_hw_bstuck_nfcal(ah); 359 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 360 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 361 sc->beacon.bmisscnt = 0; 362 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 363 } 364 365 return; 366 } 367 368 slot = ath9k_beacon_choose_slot(sc); 369 vif = sc->beacon.bslot[slot]; 370 371 /* EDMA devices check that in the tx completion function. */ 372 if (!edma) { 373 if (ath9k_is_chanctx_enabled()) { 374 ath_chanctx_beacon_sent_ev(sc, 375 ATH_CHANCTX_EVENT_BEACON_SENT); 376 } 377 378 if (ath9k_csa_is_finished(sc, vif)) 379 return; 380 } 381 382 if (!vif || !vif->bss_conf.enable_beacon) 383 return; 384 385 if (ath9k_is_chanctx_enabled()) { 386 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE); 387 } 388 389 bf = ath9k_beacon_generate(sc->hw, vif); 390 391 if (sc->beacon.bmisscnt != 0) { 392 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 393 sc->beacon.bmisscnt); 394 sc->beacon.bmisscnt = 0; 395 } 396 397 /* 398 * Handle slot time change when a non-ERP station joins/leaves 399 * an 11g network. The 802.11 layer notifies us via callback, 400 * we mark updateslot, then wait one beacon before effecting 401 * the change. This gives associated stations at least one 402 * beacon interval to note the state change. 403 * 404 * NB: The slot time change state machine is clocked according 405 * to whether we are bursting or staggering beacons. We 406 * recognize the request to update and record the current 407 * slot then don't transition until that slot is reached 408 * again. If we miss a beacon for that slot then we'll be 409 * slow to transition but we'll be sure at least one beacon 410 * interval has passed. When bursting slot is always left 411 * set to ATH_BCBUF so this check is a noop. 412 */ 413 if (sc->beacon.updateslot == UPDATE) { 414 sc->beacon.updateslot = COMMIT; 415 sc->beacon.slotupdate = slot; 416 } else if (sc->beacon.updateslot == COMMIT && 417 sc->beacon.slotupdate == slot) { 418 ah->slottime = sc->beacon.slottime; 419 ath9k_hw_init_global_settings(ah); 420 sc->beacon.updateslot = OK; 421 } 422 423 if (bf) { 424 ath9k_reset_beacon_status(sc); 425 426 ath_dbg(common, BEACON, 427 "Transmitting beacon for slot: %d\n", slot); 428 429 /* NB: cabq traffic should already be queued and primed */ 430 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 431 432 if (!edma) 433 ath9k_hw_txstart(ah, sc->beacon.beaconq); 434 } 435 } 436 437 /* 438 * Both nexttbtt and intval have to be in usecs. 439 */ 440 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 441 u32 intval, bool reset_tsf) 442 { 443 struct ath_hw *ah = sc->sc_ah; 444 445 ath9k_hw_disable_interrupts(ah); 446 if (reset_tsf) 447 ath9k_hw_reset_tsf(ah); 448 ath9k_beaconq_config(sc); 449 ath9k_hw_beaconinit(ah, nexttbtt, intval); 450 sc->beacon.bmisscnt = 0; 451 ath9k_hw_set_interrupts(ah); 452 ath9k_hw_enable_interrupts(ah); 453 } 454 455 /* 456 * For multi-bss ap support beacons are either staggered evenly over N slots or 457 * burst together. For the former arrange for the SWBA to be delivered for each 458 * slot. Slots that are not occupied will generate nothing. 459 */ 460 static void ath9k_beacon_config_ap(struct ath_softc *sc, 461 struct ath_beacon_config *conf) 462 { 463 struct ath_hw *ah = sc->sc_ah; 464 465 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF); 466 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false); 467 } 468 469 static void ath9k_beacon_config_sta(struct ath_hw *ah, 470 struct ath_beacon_config *conf) 471 { 472 struct ath9k_beacon_state bs; 473 474 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM) 475 return; 476 477 ath9k_hw_disable_interrupts(ah); 478 ath9k_hw_set_sta_beacon_timers(ah, &bs); 479 ah->imask |= ATH9K_INT_BMISS; 480 481 ath9k_hw_set_interrupts(ah); 482 ath9k_hw_enable_interrupts(ah); 483 } 484 485 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 486 struct ath_beacon_config *conf) 487 { 488 struct ath_hw *ah = sc->sc_ah; 489 struct ath_common *common = ath9k_hw_common(ah); 490 491 ath9k_reset_beacon_status(sc); 492 493 ath9k_cmn_beacon_config_adhoc(ah, conf); 494 495 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator); 496 497 /* 498 * Set the global 'beacon has been configured' flag for the 499 * joiner case in IBSS mode. 500 */ 501 if (!conf->ibss_creator && conf->enable_beacon) 502 set_bit(ATH_OP_BEACONS, &common->op_flags); 503 } 504 505 static bool ath9k_allow_beacon_config(struct ath_softc *sc, 506 struct ieee80211_vif *vif) 507 { 508 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 509 struct ath_vif *avp = (void *)vif->drv_priv; 510 511 if (ath9k_is_chanctx_enabled()) { 512 /* 513 * If the VIF is not present in the current channel context, 514 * then we can't do the usual opmode checks. Allow the 515 * beacon config for the VIF to be updated in this case and 516 * return immediately. 517 */ 518 if (sc->cur_chan != avp->chanctx) 519 return true; 520 } 521 522 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 523 if ((vif->type != NL80211_IFTYPE_AP) || 524 (sc->nbcnvifs > 1)) { 525 ath_dbg(common, CONFIG, 526 "An AP interface is already present !\n"); 527 return false; 528 } 529 } 530 531 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 532 if ((vif->type == NL80211_IFTYPE_STATION) && 533 test_bit(ATH_OP_BEACONS, &common->op_flags) && 534 vif != sc->cur_chan->primary_sta) { 535 ath_dbg(common, CONFIG, 536 "Beacon already configured for a station interface\n"); 537 return false; 538 } 539 } 540 541 return true; 542 } 543 544 static void ath9k_cache_beacon_config(struct ath_softc *sc, 545 struct ath_chanctx *ctx, 546 struct ieee80211_bss_conf *bss_conf) 547 { 548 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 549 struct ath_beacon_config *cur_conf = &ctx->beacon; 550 551 ath_dbg(common, BEACON, 552 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 553 554 cur_conf->beacon_interval = bss_conf->beacon_int; 555 cur_conf->dtim_period = bss_conf->dtim_period; 556 cur_conf->dtim_count = 1; 557 cur_conf->ibss_creator = bss_conf->ibss_creator; 558 559 /* 560 * It looks like mac80211 may end up using beacon interval of zero in 561 * some cases (at least for mesh point). Avoid getting into an 562 * infinite loop by using a bit safer value instead. To be safe, 563 * do sanity check on beacon interval for all operating modes. 564 */ 565 if (cur_conf->beacon_interval == 0) 566 cur_conf->beacon_interval = 100; 567 568 cur_conf->bmiss_timeout = 569 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 570 571 /* 572 * We don't parse dtim period from mac80211 during the driver 573 * initialization as it breaks association with hidden-ssid 574 * AP and it causes latency in roaming 575 */ 576 if (cur_conf->dtim_period == 0) 577 cur_conf->dtim_period = 1; 578 579 } 580 581 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 582 u32 changed) 583 { 584 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 585 struct ath_hw *ah = sc->sc_ah; 586 struct ath_common *common = ath9k_hw_common(ah); 587 struct ath_vif *avp = (void *)vif->drv_priv; 588 struct ath_chanctx *ctx = avp->chanctx; 589 struct ath_beacon_config *cur_conf; 590 unsigned long flags; 591 bool skip_beacon = false; 592 593 if (!ctx) 594 return; 595 596 cur_conf = &avp->chanctx->beacon; 597 if (vif->type == NL80211_IFTYPE_AP) 598 ath9k_set_tsfadjust(sc, vif); 599 600 if (!ath9k_allow_beacon_config(sc, vif)) 601 return; 602 603 if (vif->type == NL80211_IFTYPE_STATION) { 604 ath9k_cache_beacon_config(sc, ctx, bss_conf); 605 if (ctx != sc->cur_chan) 606 return; 607 608 ath9k_set_beacon(sc); 609 set_bit(ATH_OP_BEACONS, &common->op_flags); 610 return; 611 } 612 613 /* 614 * Take care of multiple interfaces when 615 * enabling/disabling SWBA. 616 */ 617 if (changed & BSS_CHANGED_BEACON_ENABLED) { 618 if (!bss_conf->enable_beacon && 619 (sc->nbcnvifs <= 1)) { 620 cur_conf->enable_beacon = false; 621 } else if (bss_conf->enable_beacon) { 622 cur_conf->enable_beacon = true; 623 ath9k_cache_beacon_config(sc, ctx, bss_conf); 624 } 625 } 626 627 if (ctx != sc->cur_chan) 628 return; 629 630 /* 631 * Configure the HW beacon registers only when we have a valid 632 * beacon interval. 633 */ 634 if (cur_conf->beacon_interval) { 635 /* 636 * If we are joining an existing IBSS network, start beaconing 637 * only after a TSF-sync has taken place. Ensure that this 638 * happens by setting the appropriate flags. 639 */ 640 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 641 bss_conf->enable_beacon) { 642 spin_lock_irqsave(&sc->sc_pm_lock, flags); 643 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 644 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 645 skip_beacon = true; 646 } else { 647 ath9k_set_beacon(sc); 648 } 649 650 /* 651 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode 652 * here, it is done in ath9k_beacon_config_adhoc(). 653 */ 654 if (cur_conf->enable_beacon && !skip_beacon) 655 set_bit(ATH_OP_BEACONS, &common->op_flags); 656 else 657 clear_bit(ATH_OP_BEACONS, &common->op_flags); 658 } 659 } 660 661 void ath9k_set_beacon(struct ath_softc *sc) 662 { 663 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 664 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 665 666 switch (sc->sc_ah->opmode) { 667 case NL80211_IFTYPE_AP: 668 case NL80211_IFTYPE_MESH_POINT: 669 ath9k_beacon_config_ap(sc, cur_conf); 670 break; 671 case NL80211_IFTYPE_ADHOC: 672 ath9k_beacon_config_adhoc(sc, cur_conf); 673 break; 674 case NL80211_IFTYPE_STATION: 675 ath9k_beacon_config_sta(sc->sc_ah, cur_conf); 676 break; 677 default: 678 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 679 return; 680 } 681 } 682