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 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 } 111 112 static 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 } 194 195 void 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 sc->nbcnvifs++; 213 214 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", 215 avp->av_bslot); 216 } 217 218 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 219 { 220 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 221 struct ath_vif *avp = (void *)vif->drv_priv; 222 struct ath_buf *bf = avp->av_bcbuf; 223 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 224 225 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", 226 avp->av_bslot); 227 228 tasklet_disable(&sc->bcon_tasklet); 229 230 cur_conf->enable_beacon &= ~BIT(avp->av_bslot); 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 (ath9k_is_chanctx_enabled()) { 379 ath_chanctx_beacon_sent_ev(sc, 380 ATH_CHANCTX_EVENT_BEACON_SENT); 381 } 382 383 if (ath9k_csa_is_finished(sc, vif)) 384 return; 385 } 386 387 if (!vif || !vif->bss_conf.enable_beacon) 388 return; 389 390 if (ath9k_is_chanctx_enabled()) { 391 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE); 392 } 393 394 bf = ath9k_beacon_generate(sc->hw, vif); 395 396 if (sc->beacon.bmisscnt != 0) { 397 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 398 sc->beacon.bmisscnt); 399 sc->beacon.bmisscnt = 0; 400 } 401 402 /* 403 * Handle slot time change when a non-ERP station joins/leaves 404 * an 11g network. The 802.11 layer notifies us via callback, 405 * we mark updateslot, then wait one beacon before effecting 406 * the change. This gives associated stations at least one 407 * beacon interval to note the state change. 408 * 409 * NB: The slot time change state machine is clocked according 410 * to whether we are bursting or staggering beacons. We 411 * recognize the request to update and record the current 412 * slot then don't transition until that slot is reached 413 * again. If we miss a beacon for that slot then we'll be 414 * slow to transition but we'll be sure at least one beacon 415 * interval has passed. When bursting slot is always left 416 * set to ATH_BCBUF so this check is a noop. 417 */ 418 if (sc->beacon.updateslot == UPDATE) { 419 sc->beacon.updateslot = COMMIT; 420 sc->beacon.slotupdate = slot; 421 } else if (sc->beacon.updateslot == COMMIT && 422 sc->beacon.slotupdate == slot) { 423 ah->slottime = sc->beacon.slottime; 424 ath9k_hw_init_global_settings(ah); 425 sc->beacon.updateslot = OK; 426 } 427 428 if (bf) { 429 ath9k_reset_beacon_status(sc); 430 431 ath_dbg(common, BEACON, 432 "Transmitting beacon for slot: %d\n", slot); 433 434 /* NB: cabq traffic should already be queued and primed */ 435 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 436 437 if (!edma) 438 ath9k_hw_txstart(ah, sc->beacon.beaconq); 439 } 440 } 441 442 /* 443 * Both nexttbtt and intval have to be in usecs. 444 */ 445 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 446 u32 intval, bool reset_tsf) 447 { 448 struct ath_hw *ah = sc->sc_ah; 449 450 ath9k_hw_disable_interrupts(ah); 451 if (reset_tsf) 452 ath9k_hw_reset_tsf(ah); 453 ath9k_beaconq_config(sc); 454 ath9k_hw_beaconinit(ah, nexttbtt, intval); 455 sc->beacon.bmisscnt = 0; 456 ath9k_hw_set_interrupts(ah); 457 ath9k_hw_enable_interrupts(ah); 458 } 459 460 /* 461 * For multi-bss ap support beacons are either staggered evenly over N slots or 462 * burst together. For the former arrange for the SWBA to be delivered for each 463 * slot. Slots that are not occupied will generate nothing. 464 */ 465 static void ath9k_beacon_config_ap(struct ath_softc *sc, 466 struct ath_beacon_config *conf) 467 { 468 struct ath_hw *ah = sc->sc_ah; 469 470 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF); 471 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false); 472 } 473 474 static void ath9k_beacon_config_sta(struct ath_hw *ah, 475 struct ath_beacon_config *conf) 476 { 477 struct ath9k_beacon_state bs; 478 479 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM) 480 return; 481 482 ath9k_hw_disable_interrupts(ah); 483 ath9k_hw_set_sta_beacon_timers(ah, &bs); 484 ah->imask |= ATH9K_INT_BMISS; 485 486 ath9k_hw_set_interrupts(ah); 487 ath9k_hw_enable_interrupts(ah); 488 } 489 490 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 491 struct ath_beacon_config *conf) 492 { 493 struct ath_hw *ah = sc->sc_ah; 494 struct ath_common *common = ath9k_hw_common(ah); 495 496 ath9k_reset_beacon_status(sc); 497 498 ath9k_cmn_beacon_config_adhoc(ah, conf); 499 500 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator); 501 502 /* 503 * Set the global 'beacon has been configured' flag for the 504 * joiner case in IBSS mode. 505 */ 506 if (!conf->ibss_creator && conf->enable_beacon) 507 set_bit(ATH_OP_BEACONS, &common->op_flags); 508 } 509 510 static bool ath9k_allow_beacon_config(struct ath_softc *sc, 511 struct ieee80211_vif *vif) 512 { 513 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 514 struct ath_vif *avp = (void *)vif->drv_priv; 515 516 if (ath9k_is_chanctx_enabled()) { 517 /* 518 * If the VIF is not present in the current channel context, 519 * then we can't do the usual opmode checks. Allow the 520 * beacon config for the VIF to be updated in this case and 521 * return immediately. 522 */ 523 if (sc->cur_chan != avp->chanctx) 524 return true; 525 } 526 527 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 528 if (vif->type != NL80211_IFTYPE_AP) { 529 ath_dbg(common, CONFIG, 530 "An AP interface is already present !\n"); 531 return false; 532 } 533 } 534 535 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 536 if ((vif->type == NL80211_IFTYPE_STATION) && 537 test_bit(ATH_OP_BEACONS, &common->op_flags) && 538 vif != sc->cur_chan->primary_sta) { 539 ath_dbg(common, CONFIG, 540 "Beacon already configured for a station interface\n"); 541 return false; 542 } 543 } 544 545 return true; 546 } 547 548 static void ath9k_cache_beacon_config(struct ath_softc *sc, 549 struct ath_chanctx *ctx, 550 struct ieee80211_bss_conf *bss_conf) 551 { 552 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 553 struct ath_beacon_config *cur_conf = &ctx->beacon; 554 555 ath_dbg(common, BEACON, 556 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 557 558 cur_conf->beacon_interval = bss_conf->beacon_int; 559 cur_conf->dtim_period = bss_conf->dtim_period; 560 cur_conf->dtim_count = 1; 561 cur_conf->ibss_creator = bss_conf->ibss_creator; 562 563 /* 564 * It looks like mac80211 may end up using beacon interval of zero in 565 * some cases (at least for mesh point). Avoid getting into an 566 * infinite loop by using a bit safer value instead. To be safe, 567 * do sanity check on beacon interval for all operating modes. 568 */ 569 if (cur_conf->beacon_interval == 0) 570 cur_conf->beacon_interval = 100; 571 572 cur_conf->bmiss_timeout = 573 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 574 575 /* 576 * We don't parse dtim period from mac80211 during the driver 577 * initialization as it breaks association with hidden-ssid 578 * AP and it causes latency in roaming 579 */ 580 if (cur_conf->dtim_period == 0) 581 cur_conf->dtim_period = 1; 582 583 } 584 585 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 586 u32 changed) 587 { 588 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 589 struct ath_hw *ah = sc->sc_ah; 590 struct ath_common *common = ath9k_hw_common(ah); 591 struct ath_vif *avp = (void *)vif->drv_priv; 592 struct ath_chanctx *ctx = avp->chanctx; 593 struct ath_beacon_config *cur_conf; 594 unsigned long flags; 595 bool skip_beacon = false; 596 597 if (!ctx) 598 return; 599 600 cur_conf = &avp->chanctx->beacon; 601 if (vif->type == NL80211_IFTYPE_AP) 602 ath9k_set_tsfadjust(sc, vif); 603 604 if (!ath9k_allow_beacon_config(sc, vif)) 605 return; 606 607 if (vif->type == NL80211_IFTYPE_STATION) { 608 ath9k_cache_beacon_config(sc, ctx, bss_conf); 609 if (ctx != sc->cur_chan) 610 return; 611 612 ath9k_set_beacon(sc); 613 set_bit(ATH_OP_BEACONS, &common->op_flags); 614 return; 615 } 616 617 /* 618 * Take care of multiple interfaces when 619 * enabling/disabling SWBA. 620 */ 621 if (changed & BSS_CHANGED_BEACON_ENABLED) { 622 bool enabled = cur_conf->enable_beacon; 623 624 if (!bss_conf->enable_beacon) { 625 cur_conf->enable_beacon &= ~BIT(avp->av_bslot); 626 } else { 627 cur_conf->enable_beacon |= BIT(avp->av_bslot); 628 if (!enabled) 629 ath9k_cache_beacon_config(sc, ctx, bss_conf); 630 } 631 } 632 633 if (ctx != sc->cur_chan) 634 return; 635 636 /* 637 * Configure the HW beacon registers only when we have a valid 638 * beacon interval. 639 */ 640 if (cur_conf->beacon_interval) { 641 /* 642 * If we are joining an existing IBSS network, start beaconing 643 * only after a TSF-sync has taken place. Ensure that this 644 * happens by setting the appropriate flags. 645 */ 646 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 647 bss_conf->enable_beacon) { 648 spin_lock_irqsave(&sc->sc_pm_lock, flags); 649 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 650 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 651 skip_beacon = true; 652 } else { 653 ath9k_set_beacon(sc); 654 } 655 656 /* 657 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode 658 * here, it is done in ath9k_beacon_config_adhoc(). 659 */ 660 if (cur_conf->enable_beacon && !skip_beacon) 661 set_bit(ATH_OP_BEACONS, &common->op_flags); 662 else 663 clear_bit(ATH_OP_BEACONS, &common->op_flags); 664 } 665 } 666 667 void ath9k_set_beacon(struct ath_softc *sc) 668 { 669 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 670 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 671 672 switch (sc->sc_ah->opmode) { 673 case NL80211_IFTYPE_AP: 674 case NL80211_IFTYPE_MESH_POINT: 675 ath9k_beacon_config_ap(sc, cur_conf); 676 break; 677 case NL80211_IFTYPE_ADHOC: 678 ath9k_beacon_config_adhoc(sc, cur_conf); 679 break; 680 case NL80211_IFTYPE_STATION: 681 ath9k_beacon_config_sta(sc->sc_ah, cur_conf); 682 break; 683 default: 684 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 685 return; 686 } 687 } 688