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 = &sc->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 } 110 111 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_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 } 276 277 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 u64 tsfadjust; 283 284 if (avp->av_bslot == 0) 285 return; 286 287 tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF; 288 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); 289 290 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", 291 (unsigned long long)tsfadjust, avp->av_bslot); 292 } 293 294 void ath9k_beacon_tasklet(unsigned long data) 295 { 296 struct ath_softc *sc = (struct ath_softc *)data; 297 struct ath_hw *ah = sc->sc_ah; 298 struct ath_common *common = ath9k_hw_common(ah); 299 struct ath_buf *bf = NULL; 300 struct ieee80211_vif *vif; 301 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 302 int slot; 303 304 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) { 305 ath_dbg(common, RESET, 306 "reset work is pending, skip beaconing now\n"); 307 return; 308 } 309 310 /* 311 * Check if the previous beacon has gone out. If 312 * not don't try to post another, skip this period 313 * and wait for the next. Missed beacons indicate 314 * a problem and should not occur. If we miss too 315 * many consecutive beacons reset the device. 316 */ 317 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 318 sc->beacon.bmisscnt++; 319 320 if (!ath9k_hw_check_alive(ah)) 321 ieee80211_queue_work(sc->hw, &sc->hw_check_work); 322 323 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 324 ath_dbg(common, BSTUCK, 325 "missed %u consecutive beacons\n", 326 sc->beacon.bmisscnt); 327 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 328 if (sc->beacon.bmisscnt > 3) 329 ath9k_hw_bstuck_nfcal(ah); 330 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 331 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 332 sc->beacon.bmisscnt = 0; 333 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 334 } 335 336 return; 337 } 338 339 slot = ath9k_beacon_choose_slot(sc); 340 vif = sc->beacon.bslot[slot]; 341 342 if (!vif || !vif->bss_conf.enable_beacon) 343 return; 344 345 bf = ath9k_beacon_generate(sc->hw, vif); 346 347 if (sc->beacon.bmisscnt != 0) { 348 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 349 sc->beacon.bmisscnt); 350 sc->beacon.bmisscnt = 0; 351 } 352 353 /* 354 * Handle slot time change when a non-ERP station joins/leaves 355 * an 11g network. The 802.11 layer notifies us via callback, 356 * we mark updateslot, then wait one beacon before effecting 357 * the change. This gives associated stations at least one 358 * beacon interval to note the state change. 359 * 360 * NB: The slot time change state machine is clocked according 361 * to whether we are bursting or staggering beacons. We 362 * recognize the request to update and record the current 363 * slot then don't transition until that slot is reached 364 * again. If we miss a beacon for that slot then we'll be 365 * slow to transition but we'll be sure at least one beacon 366 * interval has passed. When bursting slot is always left 367 * set to ATH_BCBUF so this check is a noop. 368 */ 369 if (sc->beacon.updateslot == UPDATE) { 370 sc->beacon.updateslot = COMMIT; 371 sc->beacon.slotupdate = slot; 372 } else if (sc->beacon.updateslot == COMMIT && 373 sc->beacon.slotupdate == slot) { 374 ah->slottime = sc->beacon.slottime; 375 ath9k_hw_init_global_settings(ah); 376 sc->beacon.updateslot = OK; 377 } 378 379 if (bf) { 380 ath9k_reset_beacon_status(sc); 381 382 ath_dbg(common, BEACON, 383 "Transmitting beacon for slot: %d\n", slot); 384 385 /* NB: cabq traffic should already be queued and primed */ 386 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 387 388 if (!edma) 389 ath9k_hw_txstart(ah, sc->beacon.beaconq); 390 } 391 } 392 393 /* 394 * Both nexttbtt and intval have to be in usecs. 395 */ 396 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 397 u32 intval, bool reset_tsf) 398 { 399 struct ath_hw *ah = sc->sc_ah; 400 401 ath9k_hw_disable_interrupts(ah); 402 if (reset_tsf) 403 ath9k_hw_reset_tsf(ah); 404 ath9k_beaconq_config(sc); 405 ath9k_hw_beaconinit(ah, nexttbtt, intval); 406 sc->beacon.bmisscnt = 0; 407 ath9k_hw_set_interrupts(ah); 408 ath9k_hw_enable_interrupts(ah); 409 } 410 411 /* 412 * For multi-bss ap support beacons are either staggered evenly over N slots or 413 * burst together. For the former arrange for the SWBA to be delivered for each 414 * slot. Slots that are not occupied will generate nothing. 415 */ 416 static void ath9k_beacon_config_ap(struct ath_softc *sc, 417 struct ath_beacon_config *conf) 418 { 419 struct ath_hw *ah = sc->sc_ah; 420 struct ath_common *common = ath9k_hw_common(ah); 421 u32 nexttbtt, intval; 422 423 /* NB: the beacon interval is kept internally in TU's */ 424 intval = TU_TO_USEC(conf->beacon_interval); 425 intval /= ATH_BCBUF; 426 nexttbtt = intval; 427 428 if (conf->enable_beacon) 429 ah->imask |= ATH9K_INT_SWBA; 430 else 431 ah->imask &= ~ATH9K_INT_SWBA; 432 433 ath_dbg(common, BEACON, 434 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 435 (conf->enable_beacon) ? "Enable" : "Disable", 436 nexttbtt, intval, conf->beacon_interval); 437 438 ath9k_beacon_init(sc, nexttbtt, intval, true); 439 } 440 441 /* 442 * This sets up the beacon timers according to the timestamp of the last 443 * received beacon and the current TSF, configures PCF and DTIM 444 * handling, programs the sleep registers so the hardware will wakeup in 445 * time to receive beacons, and configures the beacon miss handling so 446 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 447 * we've associated with. 448 */ 449 static void ath9k_beacon_config_sta(struct ath_softc *sc, 450 struct ath_beacon_config *conf) 451 { 452 struct ath_hw *ah = sc->sc_ah; 453 struct ath_common *common = ath9k_hw_common(ah); 454 struct ath9k_beacon_state bs; 455 int dtimperiod, dtimcount, sleepduration; 456 int cfpperiod, cfpcount; 457 u32 nexttbtt = 0, intval, tsftu; 458 u64 tsf; 459 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 460 461 /* No need to configure beacon if we are not associated */ 462 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { 463 ath_dbg(common, BEACON, 464 "STA is not yet associated..skipping beacon config\n"); 465 return; 466 } 467 468 memset(&bs, 0, sizeof(bs)); 469 intval = conf->beacon_interval; 470 471 /* 472 * Setup dtim and cfp parameters according to 473 * last beacon we received (which may be none). 474 */ 475 dtimperiod = conf->dtim_period; 476 dtimcount = conf->dtim_count; 477 if (dtimcount >= dtimperiod) /* NB: sanity check */ 478 dtimcount = 0; 479 cfpperiod = 1; /* NB: no PCF support yet */ 480 cfpcount = 0; 481 482 sleepduration = conf->listen_interval * intval; 483 484 /* 485 * Pull nexttbtt forward to reflect the current 486 * TSF and calculate dtim+cfp state for the result. 487 */ 488 tsf = ath9k_hw_gettsf64(ah); 489 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 490 491 num_beacons = tsftu / intval + 1; 492 offset = tsftu % intval; 493 nexttbtt = tsftu - offset; 494 if (offset) 495 nexttbtt += intval; 496 497 /* DTIM Beacon every dtimperiod Beacon */ 498 dtim_dec_count = num_beacons % dtimperiod; 499 /* CFP every cfpperiod DTIM Beacon */ 500 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 501 if (dtim_dec_count) 502 cfp_dec_count++; 503 504 dtimcount -= dtim_dec_count; 505 if (dtimcount < 0) 506 dtimcount += dtimperiod; 507 508 cfpcount -= cfp_dec_count; 509 if (cfpcount < 0) 510 cfpcount += cfpperiod; 511 512 bs.bs_intval = intval; 513 bs.bs_nexttbtt = nexttbtt; 514 bs.bs_dtimperiod = dtimperiod*intval; 515 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 516 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 517 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 518 bs.bs_cfpmaxduration = 0; 519 520 /* 521 * Calculate the number of consecutive beacons to miss* before taking 522 * a BMISS interrupt. The configuration is specified in TU so we only 523 * need calculate based on the beacon interval. Note that we clamp the 524 * result to at most 15 beacons. 525 */ 526 if (sleepduration > intval) { 527 bs.bs_bmissthreshold = conf->listen_interval * 528 ATH_DEFAULT_BMISS_LIMIT / 2; 529 } else { 530 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 531 if (bs.bs_bmissthreshold > 15) 532 bs.bs_bmissthreshold = 15; 533 else if (bs.bs_bmissthreshold <= 0) 534 bs.bs_bmissthreshold = 1; 535 } 536 537 /* 538 * Calculate sleep duration. The configuration is given in ms. 539 * We ensure a multiple of the beacon period is used. Also, if the sleep 540 * duration is greater than the DTIM period then it makes senses 541 * to make it a multiple of that. 542 * 543 * XXX fixed at 100ms 544 */ 545 546 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 547 if (bs.bs_sleepduration > bs.bs_dtimperiod) 548 bs.bs_sleepduration = bs.bs_dtimperiod; 549 550 /* TSF out of range threshold fixed at 1 second */ 551 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 552 553 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 554 ath_dbg(common, BEACON, 555 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 556 bs.bs_bmissthreshold, bs.bs_sleepduration, 557 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 558 559 /* Set the computed STA beacon timers */ 560 561 ath9k_hw_disable_interrupts(ah); 562 ath9k_hw_set_sta_beacon_timers(ah, &bs); 563 ah->imask |= ATH9K_INT_BMISS; 564 565 ath9k_hw_set_interrupts(ah); 566 ath9k_hw_enable_interrupts(ah); 567 } 568 569 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 570 struct ath_beacon_config *conf) 571 { 572 struct ath_hw *ah = sc->sc_ah; 573 struct ath_common *common = ath9k_hw_common(ah); 574 u32 intval, nexttbtt; 575 576 ath9k_reset_beacon_status(sc); 577 578 intval = TU_TO_USEC(conf->beacon_interval); 579 580 if (conf->ibss_creator) { 581 nexttbtt = intval; 582 } else { 583 u32 tbtt, offset, tsftu; 584 u64 tsf; 585 586 /* 587 * Pull nexttbtt forward to reflect the current 588 * sync'd TSF. 589 */ 590 tsf = ath9k_hw_gettsf64(ah); 591 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE; 592 offset = tsftu % conf->beacon_interval; 593 tbtt = tsftu - offset; 594 if (offset) 595 tbtt += conf->beacon_interval; 596 597 nexttbtt = TU_TO_USEC(tbtt); 598 } 599 600 if (conf->enable_beacon) 601 ah->imask |= ATH9K_INT_SWBA; 602 else 603 ah->imask &= ~ATH9K_INT_SWBA; 604 605 ath_dbg(common, BEACON, 606 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 607 (conf->enable_beacon) ? "Enable" : "Disable", 608 nexttbtt, intval, conf->beacon_interval); 609 610 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); 611 612 /* 613 * Set the global 'beacon has been configured' flag for the 614 * joiner case in IBSS mode. 615 */ 616 if (!conf->ibss_creator && conf->enable_beacon) 617 set_bit(SC_OP_BEACONS, &sc->sc_flags); 618 } 619 620 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 621 { 622 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 623 struct ath_vif *avp = (void *)vif->drv_priv; 624 625 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 626 if ((vif->type != NL80211_IFTYPE_AP) || 627 (sc->nbcnvifs > 1)) { 628 ath_dbg(common, CONFIG, 629 "An AP interface is already present !\n"); 630 return false; 631 } 632 } 633 634 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 635 if ((vif->type == NL80211_IFTYPE_STATION) && 636 test_bit(SC_OP_BEACONS, &sc->sc_flags) && 637 !avp->primary_sta_vif) { 638 ath_dbg(common, CONFIG, 639 "Beacon already configured for a station interface\n"); 640 return false; 641 } 642 } 643 644 return true; 645 } 646 647 static void ath9k_cache_beacon_config(struct ath_softc *sc, 648 struct ieee80211_bss_conf *bss_conf) 649 { 650 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 651 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 652 653 ath_dbg(common, BEACON, 654 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 655 656 cur_conf->beacon_interval = bss_conf->beacon_int; 657 cur_conf->dtim_period = bss_conf->dtim_period; 658 cur_conf->listen_interval = 1; 659 cur_conf->dtim_count = 1; 660 cur_conf->ibss_creator = bss_conf->ibss_creator; 661 cur_conf->bmiss_timeout = 662 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 663 664 /* 665 * It looks like mac80211 may end up using beacon interval of zero in 666 * some cases (at least for mesh point). Avoid getting into an 667 * infinite loop by using a bit safer value instead. To be safe, 668 * do sanity check on beacon interval for all operating modes. 669 */ 670 if (cur_conf->beacon_interval == 0) 671 cur_conf->beacon_interval = 100; 672 673 /* 674 * We don't parse dtim period from mac80211 during the driver 675 * initialization as it breaks association with hidden-ssid 676 * AP and it causes latency in roaming 677 */ 678 if (cur_conf->dtim_period == 0) 679 cur_conf->dtim_period = 1; 680 681 } 682 683 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 684 u32 changed) 685 { 686 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 687 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 688 unsigned long flags; 689 bool skip_beacon = false; 690 691 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 692 ath9k_cache_beacon_config(sc, bss_conf); 693 ath9k_set_beacon(sc); 694 set_bit(SC_OP_BEACONS, &sc->sc_flags); 695 return; 696 697 } 698 699 /* 700 * Take care of multiple interfaces when 701 * enabling/disabling SWBA. 702 */ 703 if (changed & BSS_CHANGED_BEACON_ENABLED) { 704 if (!bss_conf->enable_beacon && 705 (sc->nbcnvifs <= 1)) { 706 cur_conf->enable_beacon = false; 707 } else if (bss_conf->enable_beacon) { 708 cur_conf->enable_beacon = true; 709 ath9k_cache_beacon_config(sc, bss_conf); 710 } 711 } 712 713 /* 714 * Configure the HW beacon registers only when we have a valid 715 * beacon interval. 716 */ 717 if (cur_conf->beacon_interval) { 718 /* 719 * If we are joining an existing IBSS network, start beaconing 720 * only after a TSF-sync has taken place. Ensure that this 721 * happens by setting the appropriate flags. 722 */ 723 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 724 bss_conf->enable_beacon) { 725 spin_lock_irqsave(&sc->sc_pm_lock, flags); 726 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 727 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 728 skip_beacon = true; 729 } else { 730 ath9k_set_beacon(sc); 731 } 732 733 /* 734 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode 735 * here, it is done in ath9k_beacon_config_adhoc(). 736 */ 737 if (cur_conf->enable_beacon && !skip_beacon) 738 set_bit(SC_OP_BEACONS, &sc->sc_flags); 739 else 740 clear_bit(SC_OP_BEACONS, &sc->sc_flags); 741 } 742 } 743 744 void ath9k_set_beacon(struct ath_softc *sc) 745 { 746 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 747 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 748 749 switch (sc->sc_ah->opmode) { 750 case NL80211_IFTYPE_AP: 751 case NL80211_IFTYPE_MESH_POINT: 752 ath9k_beacon_config_ap(sc, cur_conf); 753 break; 754 case NL80211_IFTYPE_ADHOC: 755 ath9k_beacon_config_adhoc(sc, cur_conf); 756 break; 757 case NL80211_IFTYPE_STATION: 758 ath9k_beacon_config_sta(sc, cur_conf); 759 break; 760 default: 761 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 762 return; 763 } 764 } 765