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, 0); 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_in_atomic(&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->bss_conf.csa_active) 366 return false; 367 368 if (!ieee80211_beacon_cntdwn_is_complete(vif, 0)) 369 return false; 370 371 ieee80211_csa_finish(vif, 0); 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(struct tasklet_struct *t) 389{ 390 struct ath_softc *sc = from_tasklet(sc, t, bcon_tasklet); 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_vif *vif) 589{ 590 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 591 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 592 struct ath_beacon_config *cur_conf = &ctx->beacon; 593 594 ath_dbg(common, BEACON, 595 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 596 597 cur_conf->beacon_interval = bss_conf->beacon_int; 598 cur_conf->dtim_period = bss_conf->dtim_period; 599 cur_conf->dtim_count = 1; 600 cur_conf->ibss_creator = vif->cfg.ibss_creator; 601 602 /* 603 * It looks like mac80211 may end up using beacon interval of zero in 604 * some cases (at least for mesh point). Avoid getting into an 605 * infinite loop by using a bit safer value instead. To be safe, 606 * do sanity check on beacon interval for all operating modes. 607 */ 608 if (cur_conf->beacon_interval == 0) 609 cur_conf->beacon_interval = 100; 610 611 cur_conf->bmiss_timeout = 612 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 613 614 /* 615 * We don't parse dtim period from mac80211 during the driver 616 * initialization as it breaks association with hidden-ssid 617 * AP and it causes latency in roaming 618 */ 619 if (cur_conf->dtim_period == 0) 620 cur_conf->dtim_period = 1; 621 622 ath9k_set_tsfadjust(sc, cur_conf); 623} 624 625void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *main_vif, 626 bool beacons) 627{ 628 struct ath_hw *ah = sc->sc_ah; 629 struct ath_common *common = ath9k_hw_common(ah); 630 struct ath_vif *avp; 631 struct ath_chanctx *ctx; 632 struct ath_beacon_config *cur_conf; 633 unsigned long flags; 634 bool enabled; 635 bool skip_beacon = false; 636 637 if (!beacons) { 638 clear_bit(ATH_OP_BEACONS, &common->op_flags); 639 ath9k_beacon_stop(sc); 640 return; 641 } 642 643 if (WARN_ON(!main_vif)) 644 return; 645 646 avp = (void *)main_vif->drv_priv; 647 ctx = avp->chanctx; 648 cur_conf = &ctx->beacon; 649 enabled = cur_conf->enable_beacon; 650 cur_conf->enable_beacon = beacons; 651 652 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 653 ath9k_cache_beacon_config(sc, ctx, main_vif); 654 655 ath9k_set_beacon(sc); 656 set_bit(ATH_OP_BEACONS, &common->op_flags); 657 return; 658 } 659 660 /* Update the beacon configuration. */ 661 ath9k_cache_beacon_config(sc, ctx, main_vif); 662 663 /* 664 * Configure the HW beacon registers only when we have a valid 665 * beacon interval. 666 */ 667 if (cur_conf->beacon_interval) { 668 /* Special case to sync the TSF when joining an existing IBSS. 669 * This is only done if no AP interface is active. 670 * Note that mac80211 always resets the TSF when creating a new 671 * IBSS interface. 672 */ 673 if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC && 674 !enabled && beacons && !main_vif->cfg.ibss_creator) { 675 spin_lock_irqsave(&sc->sc_pm_lock, flags); 676 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 677 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 678 skip_beacon = true; 679 } 680 681 /* 682 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode 683 * here, it is done in ath9k_beacon_config_adhoc(). 684 */ 685 if (beacons && !skip_beacon) { 686 set_bit(ATH_OP_BEACONS, &common->op_flags); 687 ath9k_set_beacon(sc); 688 } else { 689 clear_bit(ATH_OP_BEACONS, &common->op_flags); 690 ath9k_beacon_stop(sc); 691 } 692 } else { 693 clear_bit(ATH_OP_BEACONS, &common->op_flags); 694 ath9k_beacon_stop(sc); 695 } 696} 697 698void ath9k_set_beacon(struct ath_softc *sc) 699{ 700 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 701 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; 702 703 switch (sc->sc_ah->opmode) { 704 case NL80211_IFTYPE_AP: 705 case NL80211_IFTYPE_MESH_POINT: 706 ath9k_beacon_config_ap(sc, cur_conf); 707 break; 708 case NL80211_IFTYPE_ADHOC: 709 ath9k_beacon_config_adhoc(sc, cur_conf); 710 break; 711 case NL80211_IFTYPE_STATION: 712 ath9k_beacon_config_sta(sc->sc_ah, cur_conf); 713 break; 714 default: 715 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 716 return; 717 } 718} 719