beacon.c revision 4c9a1f32600b9181558737dede31403c1ca05291
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 == 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*/ 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 rate = 0; 82 83 sband = &common->sbands[common->hw->conf.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 111static 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 198void 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 221void 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 249static 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_beacon_conf; 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 277static 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_beacon_config *cur_conf = &sc->cur_beacon_conf; 281 struct ath_vif *avp = (void *)vif->drv_priv; 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 295bool 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 307static 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 313void ath9k_csa_update(struct ath_softc *sc) 314{ 315 ieee80211_iterate_active_interfaces(sc->hw, 316 IEEE80211_IFACE_ITER_NORMAL, 317 ath9k_csa_update_vif, 318 sc); 319} 320 321void ath9k_beacon_tasklet(unsigned long data) 322{ 323 struct ath_softc *sc = (struct ath_softc *)data; 324 struct ath_hw *ah = sc->sc_ah; 325 struct ath_common *common = ath9k_hw_common(ah); 326 struct ath_buf *bf = NULL; 327 struct ieee80211_vif *vif; 328 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 329 int slot; 330 331 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) { 332 ath_dbg(common, RESET, 333 "reset work is pending, skip beaconing now\n"); 334 return; 335 } 336 337 /* 338 * Check if the previous beacon has gone out. If 339 * not don't try to post another, skip this period 340 * and wait for the next. Missed beacons indicate 341 * a problem and should not occur. If we miss too 342 * many consecutive beacons reset the device. 343 */ 344 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 345 sc->beacon.bmisscnt++; 346 347 ath9k_hw_check_nav(ah); 348 349 /* 350 * If the previous beacon has not been transmitted 351 * and a MAC/BB hang has been identified, return 352 * here because a chip reset would have been 353 * initiated. 354 */ 355 if (!ath_hw_check(sc)) 356 return; 357 358 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 359 ath_dbg(common, BSTUCK, 360 "missed %u consecutive beacons\n", 361 sc->beacon.bmisscnt); 362 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 363 if (sc->beacon.bmisscnt > 3) 364 ath9k_hw_bstuck_nfcal(ah); 365 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 366 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 367 sc->beacon.bmisscnt = 0; 368 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 369 } 370 371 return; 372 } 373 374 slot = ath9k_beacon_choose_slot(sc); 375 vif = sc->beacon.bslot[slot]; 376 377 /* EDMA devices check that in the tx completion function. */ 378 if (!edma && ath9k_csa_is_finished(sc, vif)) 379 return; 380 381 if (!vif || !vif->bss_conf.enable_beacon) 382 return; 383 384 bf = ath9k_beacon_generate(sc->hw, vif); 385 386 if (sc->beacon.bmisscnt != 0) { 387 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 388 sc->beacon.bmisscnt); 389 sc->beacon.bmisscnt = 0; 390 } 391 392 /* 393 * Handle slot time change when a non-ERP station joins/leaves 394 * an 11g network. The 802.11 layer notifies us via callback, 395 * we mark updateslot, then wait one beacon before effecting 396 * the change. This gives associated stations at least one 397 * beacon interval to note the state change. 398 * 399 * NB: The slot time change state machine is clocked according 400 * to whether we are bursting or staggering beacons. We 401 * recognize the request to update and record the current 402 * slot then don't transition until that slot is reached 403 * again. If we miss a beacon for that slot then we'll be 404 * slow to transition but we'll be sure at least one beacon 405 * interval has passed. When bursting slot is always left 406 * set to ATH_BCBUF so this check is a noop. 407 */ 408 if (sc->beacon.updateslot == UPDATE) { 409 sc->beacon.updateslot = COMMIT; 410 sc->beacon.slotupdate = slot; 411 } else if (sc->beacon.updateslot == COMMIT && 412 sc->beacon.slotupdate == slot) { 413 ah->slottime = sc->beacon.slottime; 414 ath9k_hw_init_global_settings(ah); 415 sc->beacon.updateslot = OK; 416 } 417 418 if (bf) { 419 ath9k_reset_beacon_status(sc); 420 421 ath_dbg(common, BEACON, 422 "Transmitting beacon for slot: %d\n", slot); 423 424 /* NB: cabq traffic should already be queued and primed */ 425 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 426 427 if (!edma) 428 ath9k_hw_txstart(ah, sc->beacon.beaconq); 429 } 430} 431 432/* 433 * Both nexttbtt and intval have to be in usecs. 434 */ 435static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 436 u32 intval, bool reset_tsf) 437{ 438 struct ath_hw *ah = sc->sc_ah; 439 440 ath9k_hw_disable_interrupts(ah); 441 if (reset_tsf) 442 ath9k_hw_reset_tsf(ah); 443 ath9k_beaconq_config(sc); 444 ath9k_hw_beaconinit(ah, nexttbtt, intval); 445 sc->beacon.bmisscnt = 0; 446 ath9k_hw_set_interrupts(ah); 447 ath9k_hw_enable_interrupts(ah); 448} 449 450/* Calculate the modulo of a 64 bit TSF snapshot with a TU divisor */ 451static u32 ath9k_mod_tsf64_tu(u64 tsf, u32 div_tu) 452{ 453 u32 tsf_mod, tsf_hi, tsf_lo, mod_hi, mod_lo; 454 455 tsf_mod = tsf & (BIT(10) - 1); 456 tsf_hi = tsf >> 32; 457 tsf_lo = ((u32) tsf) >> 10; 458 459 mod_hi = tsf_hi % div_tu; 460 mod_lo = ((mod_hi << 22) + tsf_lo) % div_tu; 461 462 return (mod_lo << 10) | tsf_mod; 463} 464 465static u32 ath9k_get_next_tbtt(struct ath_softc *sc, u64 tsf, 466 unsigned int interval) 467{ 468 struct ath_hw *ah = sc->sc_ah; 469 unsigned int offset; 470 471 tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time); 472 offset = ath9k_mod_tsf64_tu(tsf, interval); 473 474 return (u32) tsf + TU_TO_USEC(interval) - offset; 475} 476 477/* 478 * For multi-bss ap support beacons are either staggered evenly over N slots or 479 * burst together. For the former arrange for the SWBA to be delivered for each 480 * slot. Slots that are not occupied will generate nothing. 481 */ 482static void ath9k_beacon_config_ap(struct ath_softc *sc, 483 struct ath_beacon_config *conf) 484{ 485 struct ath_hw *ah = sc->sc_ah; 486 struct ath_common *common = ath9k_hw_common(ah); 487 u32 nexttbtt, intval; 488 489 /* NB: the beacon interval is kept internally in TU's */ 490 intval = TU_TO_USEC(conf->beacon_interval); 491 intval /= ATH_BCBUF; 492 nexttbtt = ath9k_get_next_tbtt(sc, ath9k_hw_gettsf64(ah), 493 conf->beacon_interval); 494 495 if (conf->enable_beacon) 496 ah->imask |= ATH9K_INT_SWBA; 497 else 498 ah->imask &= ~ATH9K_INT_SWBA; 499 500 ath_dbg(common, BEACON, 501 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 502 (conf->enable_beacon) ? "Enable" : "Disable", 503 nexttbtt, intval, conf->beacon_interval); 504 505 ath9k_beacon_init(sc, nexttbtt, intval, false); 506} 507 508static void ath9k_beacon_config_sta(struct ath_hw *ah, 509 struct ath_beacon_config *conf) 510{ 511 struct ath9k_beacon_state bs; 512 513 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM) 514 return; 515 516 ath9k_hw_disable_interrupts(ah); 517 ath9k_hw_set_sta_beacon_timers(ah, &bs); 518 ah->imask |= ATH9K_INT_BMISS; 519 520 ath9k_hw_set_interrupts(ah); 521 ath9k_hw_enable_interrupts(ah); 522} 523 524static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 525 struct ath_beacon_config *conf) 526{ 527 struct ath_hw *ah = sc->sc_ah; 528 struct ath_common *common = ath9k_hw_common(ah); 529 530 ath9k_reset_beacon_status(sc); 531 532 ath9k_cmn_beacon_config_adhoc(ah, conf); 533 534 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator); 535 536 /* 537 * Set the global 'beacon has been configured' flag for the 538 * joiner case in IBSS mode. 539 */ 540 if (!conf->ibss_creator && conf->enable_beacon) 541 set_bit(ATH_OP_BEACONS, &common->op_flags); 542} 543 544static bool ath9k_allow_beacon_config(struct ath_softc *sc, 545 struct ieee80211_vif *vif) 546{ 547 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 548 struct ath_vif *avp = (void *)vif->drv_priv; 549 550 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 551 if ((vif->type != NL80211_IFTYPE_AP) || 552 (sc->nbcnvifs > 1)) { 553 ath_dbg(common, CONFIG, 554 "An AP interface is already present !\n"); 555 return false; 556 } 557 } 558 559 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 560 if ((vif->type == NL80211_IFTYPE_STATION) && 561 test_bit(ATH_OP_BEACONS, &common->op_flags) && 562 !avp->primary_sta_vif) { 563 ath_dbg(common, CONFIG, 564 "Beacon already configured for a station interface\n"); 565 return false; 566 } 567 } 568 569 return true; 570} 571 572static void ath9k_cache_beacon_config(struct ath_softc *sc, 573 struct ieee80211_bss_conf *bss_conf) 574{ 575 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 576 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 577 578 ath_dbg(common, BEACON, 579 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 580 581 cur_conf->beacon_interval = bss_conf->beacon_int; 582 cur_conf->dtim_period = bss_conf->dtim_period; 583 cur_conf->dtim_count = 1; 584 cur_conf->ibss_creator = bss_conf->ibss_creator; 585 cur_conf->bmiss_timeout = 586 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 587 588 /* 589 * It looks like mac80211 may end up using beacon interval of zero in 590 * some cases (at least for mesh point). Avoid getting into an 591 * infinite loop by using a bit safer value instead. To be safe, 592 * do sanity check on beacon interval for all operating modes. 593 */ 594 if (cur_conf->beacon_interval == 0) 595 cur_conf->beacon_interval = 100; 596 597 /* 598 * We don't parse dtim period from mac80211 during the driver 599 * initialization as it breaks association with hidden-ssid 600 * AP and it causes latency in roaming 601 */ 602 if (cur_conf->dtim_period == 0) 603 cur_conf->dtim_period = 1; 604 605} 606 607void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 608 u32 changed) 609{ 610 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 611 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 612 struct ath_hw *ah = sc->sc_ah; 613 struct ath_common *common = ath9k_hw_common(ah); 614 unsigned long flags; 615 bool skip_beacon = false; 616 617 if (vif->type == NL80211_IFTYPE_AP) 618 ath9k_set_tsfadjust(sc, vif); 619 620 if (!ath9k_allow_beacon_config(sc, vif)) 621 return; 622 623 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 624 ath9k_cache_beacon_config(sc, bss_conf); 625 ath9k_set_beacon(sc); 626 set_bit(ATH_OP_BEACONS, &common->op_flags); 627 return; 628 } 629 630 /* 631 * Take care of multiple interfaces when 632 * enabling/disabling SWBA. 633 */ 634 if (changed & BSS_CHANGED_BEACON_ENABLED) { 635 if (!bss_conf->enable_beacon && 636 (sc->nbcnvifs <= 1)) { 637 cur_conf->enable_beacon = false; 638 } else if (bss_conf->enable_beacon) { 639 cur_conf->enable_beacon = true; 640 ath9k_cache_beacon_config(sc, bss_conf); 641 } 642 } 643 644 /* 645 * Configure the HW beacon registers only when we have a valid 646 * beacon interval. 647 */ 648 if (cur_conf->beacon_interval) { 649 /* 650 * If we are joining an existing IBSS network, start beaconing 651 * only after a TSF-sync has taken place. Ensure that this 652 * happens by setting the appropriate flags. 653 */ 654 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 655 bss_conf->enable_beacon) { 656 spin_lock_irqsave(&sc->sc_pm_lock, flags); 657 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 658 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 659 skip_beacon = true; 660 } else { 661 ath9k_set_beacon(sc); 662 } 663 664 /* 665 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode 666 * here, it is done in ath9k_beacon_config_adhoc(). 667 */ 668 if (cur_conf->enable_beacon && !skip_beacon) 669 set_bit(ATH_OP_BEACONS, &common->op_flags); 670 else 671 clear_bit(ATH_OP_BEACONS, &common->op_flags); 672 } 673} 674 675void ath9k_set_beacon(struct ath_softc *sc) 676{ 677 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 678 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 679 680 switch (sc->sc_ah->opmode) { 681 case NL80211_IFTYPE_AP: 682 case NL80211_IFTYPE_MESH_POINT: 683 ath9k_beacon_config_ap(sc, cur_conf); 684 break; 685 case NL80211_IFTYPE_ADHOC: 686 ath9k_beacon_config_adhoc(sc, cur_conf); 687 break; 688 case NL80211_IFTYPE_STATION: 689 ath9k_beacon_config_sta(sc->sc_ah, cur_conf); 690 break; 691 default: 692 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 693 return; 694 } 695} 696