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 bool ath9k_csa_is_finished(struct ath_softc *sc) 295 { 296 struct ieee80211_vif *vif; 297 298 vif = sc->csa_vif; 299 if (!vif || !vif->csa_active) 300 return false; 301 302 if (!ieee80211_csa_is_complete(vif)) 303 return false; 304 305 ieee80211_csa_finish(vif); 306 307 sc->csa_vif = NULL; 308 return true; 309 } 310 311 void ath9k_beacon_tasklet(unsigned long data) 312 { 313 struct ath_softc *sc = (struct ath_softc *)data; 314 struct ath_hw *ah = sc->sc_ah; 315 struct ath_common *common = ath9k_hw_common(ah); 316 struct ath_buf *bf = NULL; 317 struct ieee80211_vif *vif; 318 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 319 int slot; 320 321 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) { 322 ath_dbg(common, RESET, 323 "reset work is pending, skip beaconing now\n"); 324 return; 325 } 326 327 /* 328 * Check if the previous beacon has gone out. If 329 * not don't try to post another, skip this period 330 * and wait for the next. Missed beacons indicate 331 * a problem and should not occur. If we miss too 332 * many consecutive beacons reset the device. 333 */ 334 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 335 sc->beacon.bmisscnt++; 336 337 ath9k_hw_check_nav(ah); 338 339 if (!ath9k_hw_check_alive(ah)) 340 ieee80211_queue_work(sc->hw, &sc->hw_check_work); 341 342 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 343 ath_dbg(common, BSTUCK, 344 "missed %u consecutive beacons\n", 345 sc->beacon.bmisscnt); 346 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 347 if (sc->beacon.bmisscnt > 3) 348 ath9k_hw_bstuck_nfcal(ah); 349 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 350 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 351 sc->beacon.bmisscnt = 0; 352 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 353 } 354 355 return; 356 } 357 358 /* EDMA devices check that in the tx completion function. */ 359 if (!edma && ath9k_csa_is_finished(sc)) 360 return; 361 362 slot = ath9k_beacon_choose_slot(sc); 363 vif = sc->beacon.bslot[slot]; 364 365 if (!vif || !vif->bss_conf.enable_beacon) 366 return; 367 368 bf = ath9k_beacon_generate(sc->hw, vif); 369 370 if (sc->beacon.bmisscnt != 0) { 371 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 372 sc->beacon.bmisscnt); 373 sc->beacon.bmisscnt = 0; 374 } 375 376 /* 377 * Handle slot time change when a non-ERP station joins/leaves 378 * an 11g network. The 802.11 layer notifies us via callback, 379 * we mark updateslot, then wait one beacon before effecting 380 * the change. This gives associated stations at least one 381 * beacon interval to note the state change. 382 * 383 * NB: The slot time change state machine is clocked according 384 * to whether we are bursting or staggering beacons. We 385 * recognize the request to update and record the current 386 * slot then don't transition until that slot is reached 387 * again. If we miss a beacon for that slot then we'll be 388 * slow to transition but we'll be sure at least one beacon 389 * interval has passed. When bursting slot is always left 390 * set to ATH_BCBUF so this check is a noop. 391 */ 392 if (sc->beacon.updateslot == UPDATE) { 393 sc->beacon.updateslot = COMMIT; 394 sc->beacon.slotupdate = slot; 395 } else if (sc->beacon.updateslot == COMMIT && 396 sc->beacon.slotupdate == slot) { 397 ah->slottime = sc->beacon.slottime; 398 ath9k_hw_init_global_settings(ah); 399 sc->beacon.updateslot = OK; 400 } 401 402 if (bf) { 403 ath9k_reset_beacon_status(sc); 404 405 ath_dbg(common, BEACON, 406 "Transmitting beacon for slot: %d\n", slot); 407 408 /* NB: cabq traffic should already be queued and primed */ 409 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 410 411 if (!edma) 412 ath9k_hw_txstart(ah, sc->beacon.beaconq); 413 } 414 } 415 416 /* 417 * Both nexttbtt and intval have to be in usecs. 418 */ 419 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 420 u32 intval, bool reset_tsf) 421 { 422 struct ath_hw *ah = sc->sc_ah; 423 424 ath9k_hw_disable_interrupts(ah); 425 if (reset_tsf) 426 ath9k_hw_reset_tsf(ah); 427 ath9k_beaconq_config(sc); 428 ath9k_hw_beaconinit(ah, nexttbtt, intval); 429 sc->beacon.bmisscnt = 0; 430 ath9k_hw_set_interrupts(ah); 431 ath9k_hw_enable_interrupts(ah); 432 } 433 434 /* 435 * For multi-bss ap support beacons are either staggered evenly over N slots or 436 * burst together. For the former arrange for the SWBA to be delivered for each 437 * slot. Slots that are not occupied will generate nothing. 438 */ 439 static void ath9k_beacon_config_ap(struct ath_softc *sc, 440 struct ath_beacon_config *conf) 441 { 442 struct ath_hw *ah = sc->sc_ah; 443 struct ath_common *common = ath9k_hw_common(ah); 444 u32 nexttbtt, intval; 445 446 /* NB: the beacon interval is kept internally in TU's */ 447 intval = TU_TO_USEC(conf->beacon_interval); 448 intval /= ATH_BCBUF; 449 nexttbtt = intval; 450 451 if (conf->enable_beacon) 452 ah->imask |= ATH9K_INT_SWBA; 453 else 454 ah->imask &= ~ATH9K_INT_SWBA; 455 456 ath_dbg(common, BEACON, 457 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 458 (conf->enable_beacon) ? "Enable" : "Disable", 459 nexttbtt, intval, conf->beacon_interval); 460 461 ath9k_beacon_init(sc, nexttbtt, intval, true); 462 } 463 464 /* 465 * This sets up the beacon timers according to the timestamp of the last 466 * received beacon and the current TSF, configures PCF and DTIM 467 * handling, programs the sleep registers so the hardware will wakeup in 468 * time to receive beacons, and configures the beacon miss handling so 469 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 470 * we've associated with. 471 */ 472 static void ath9k_beacon_config_sta(struct ath_softc *sc, 473 struct ath_beacon_config *conf) 474 { 475 struct ath_hw *ah = sc->sc_ah; 476 struct ath_common *common = ath9k_hw_common(ah); 477 struct ath9k_beacon_state bs; 478 int dtimperiod, dtimcount, sleepduration; 479 int cfpperiod, cfpcount; 480 u32 nexttbtt = 0, intval, tsftu; 481 u64 tsf; 482 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 483 484 /* No need to configure beacon if we are not associated */ 485 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { 486 ath_dbg(common, BEACON, 487 "STA is not yet associated..skipping beacon config\n"); 488 return; 489 } 490 491 memset(&bs, 0, sizeof(bs)); 492 intval = conf->beacon_interval; 493 494 /* 495 * Setup dtim and cfp parameters according to 496 * last beacon we received (which may be none). 497 */ 498 dtimperiod = conf->dtim_period; 499 dtimcount = conf->dtim_count; 500 if (dtimcount >= dtimperiod) /* NB: sanity check */ 501 dtimcount = 0; 502 cfpperiod = 1; /* NB: no PCF support yet */ 503 cfpcount = 0; 504 505 sleepduration = conf->listen_interval * intval; 506 507 /* 508 * Pull nexttbtt forward to reflect the current 509 * TSF and calculate dtim+cfp state for the result. 510 */ 511 tsf = ath9k_hw_gettsf64(ah); 512 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 513 514 num_beacons = tsftu / intval + 1; 515 offset = tsftu % intval; 516 nexttbtt = tsftu - offset; 517 if (offset) 518 nexttbtt += intval; 519 520 /* DTIM Beacon every dtimperiod Beacon */ 521 dtim_dec_count = num_beacons % dtimperiod; 522 /* CFP every cfpperiod DTIM Beacon */ 523 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 524 if (dtim_dec_count) 525 cfp_dec_count++; 526 527 dtimcount -= dtim_dec_count; 528 if (dtimcount < 0) 529 dtimcount += dtimperiod; 530 531 cfpcount -= cfp_dec_count; 532 if (cfpcount < 0) 533 cfpcount += cfpperiod; 534 535 bs.bs_intval = intval; 536 bs.bs_nexttbtt = nexttbtt; 537 bs.bs_dtimperiod = dtimperiod*intval; 538 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 539 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 540 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 541 bs.bs_cfpmaxduration = 0; 542 543 /* 544 * Calculate the number of consecutive beacons to miss* before taking 545 * a BMISS interrupt. The configuration is specified in TU so we only 546 * need calculate based on the beacon interval. Note that we clamp the 547 * result to at most 15 beacons. 548 */ 549 if (sleepduration > intval) { 550 bs.bs_bmissthreshold = conf->listen_interval * 551 ATH_DEFAULT_BMISS_LIMIT / 2; 552 } else { 553 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 554 if (bs.bs_bmissthreshold > 15) 555 bs.bs_bmissthreshold = 15; 556 else if (bs.bs_bmissthreshold <= 0) 557 bs.bs_bmissthreshold = 1; 558 } 559 560 /* 561 * Calculate sleep duration. The configuration is given in ms. 562 * We ensure a multiple of the beacon period is used. Also, if the sleep 563 * duration is greater than the DTIM period then it makes senses 564 * to make it a multiple of that. 565 * 566 * XXX fixed at 100ms 567 */ 568 569 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 570 if (bs.bs_sleepduration > bs.bs_dtimperiod) 571 bs.bs_sleepduration = bs.bs_dtimperiod; 572 573 /* TSF out of range threshold fixed at 1 second */ 574 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 575 576 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 577 ath_dbg(common, BEACON, 578 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 579 bs.bs_bmissthreshold, bs.bs_sleepduration, 580 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 581 582 /* Set the computed STA beacon timers */ 583 584 ath9k_hw_disable_interrupts(ah); 585 ath9k_hw_set_sta_beacon_timers(ah, &bs); 586 ah->imask |= ATH9K_INT_BMISS; 587 588 ath9k_hw_set_interrupts(ah); 589 ath9k_hw_enable_interrupts(ah); 590 } 591 592 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 593 struct ath_beacon_config *conf) 594 { 595 struct ath_hw *ah = sc->sc_ah; 596 struct ath_common *common = ath9k_hw_common(ah); 597 u32 intval, nexttbtt; 598 599 ath9k_reset_beacon_status(sc); 600 601 intval = TU_TO_USEC(conf->beacon_interval); 602 603 if (conf->ibss_creator) { 604 nexttbtt = intval; 605 } else { 606 u32 tbtt, offset, tsftu; 607 u64 tsf; 608 609 /* 610 * Pull nexttbtt forward to reflect the current 611 * sync'd TSF. 612 */ 613 tsf = ath9k_hw_gettsf64(ah); 614 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE; 615 offset = tsftu % conf->beacon_interval; 616 tbtt = tsftu - offset; 617 if (offset) 618 tbtt += conf->beacon_interval; 619 620 nexttbtt = TU_TO_USEC(tbtt); 621 } 622 623 if (conf->enable_beacon) 624 ah->imask |= ATH9K_INT_SWBA; 625 else 626 ah->imask &= ~ATH9K_INT_SWBA; 627 628 ath_dbg(common, BEACON, 629 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 630 (conf->enable_beacon) ? "Enable" : "Disable", 631 nexttbtt, intval, conf->beacon_interval); 632 633 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); 634 635 /* 636 * Set the global 'beacon has been configured' flag for the 637 * joiner case in IBSS mode. 638 */ 639 if (!conf->ibss_creator && conf->enable_beacon) 640 set_bit(SC_OP_BEACONS, &sc->sc_flags); 641 } 642 643 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 644 { 645 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 646 struct ath_vif *avp = (void *)vif->drv_priv; 647 648 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 649 if ((vif->type != NL80211_IFTYPE_AP) || 650 (sc->nbcnvifs > 1)) { 651 ath_dbg(common, CONFIG, 652 "An AP interface is already present !\n"); 653 return false; 654 } 655 } 656 657 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 658 if ((vif->type == NL80211_IFTYPE_STATION) && 659 test_bit(SC_OP_BEACONS, &sc->sc_flags) && 660 !avp->primary_sta_vif) { 661 ath_dbg(common, CONFIG, 662 "Beacon already configured for a station interface\n"); 663 return false; 664 } 665 } 666 667 return true; 668 } 669 670 static void ath9k_cache_beacon_config(struct ath_softc *sc, 671 struct ieee80211_bss_conf *bss_conf) 672 { 673 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 674 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 675 676 ath_dbg(common, BEACON, 677 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 678 679 cur_conf->beacon_interval = bss_conf->beacon_int; 680 cur_conf->dtim_period = bss_conf->dtim_period; 681 cur_conf->listen_interval = 1; 682 cur_conf->dtim_count = 1; 683 cur_conf->ibss_creator = bss_conf->ibss_creator; 684 cur_conf->bmiss_timeout = 685 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 686 687 /* 688 * It looks like mac80211 may end up using beacon interval of zero in 689 * some cases (at least for mesh point). Avoid getting into an 690 * infinite loop by using a bit safer value instead. To be safe, 691 * do sanity check on beacon interval for all operating modes. 692 */ 693 if (cur_conf->beacon_interval == 0) 694 cur_conf->beacon_interval = 100; 695 696 /* 697 * We don't parse dtim period from mac80211 during the driver 698 * initialization as it breaks association with hidden-ssid 699 * AP and it causes latency in roaming 700 */ 701 if (cur_conf->dtim_period == 0) 702 cur_conf->dtim_period = 1; 703 704 } 705 706 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 707 u32 changed) 708 { 709 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 710 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 711 unsigned long flags; 712 bool skip_beacon = false; 713 714 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 715 ath9k_cache_beacon_config(sc, bss_conf); 716 ath9k_set_beacon(sc); 717 set_bit(SC_OP_BEACONS, &sc->sc_flags); 718 return; 719 720 } 721 722 /* 723 * Take care of multiple interfaces when 724 * enabling/disabling SWBA. 725 */ 726 if (changed & BSS_CHANGED_BEACON_ENABLED) { 727 if (!bss_conf->enable_beacon && 728 (sc->nbcnvifs <= 1)) { 729 cur_conf->enable_beacon = false; 730 } else if (bss_conf->enable_beacon) { 731 cur_conf->enable_beacon = true; 732 ath9k_cache_beacon_config(sc, bss_conf); 733 } 734 } 735 736 /* 737 * Configure the HW beacon registers only when we have a valid 738 * beacon interval. 739 */ 740 if (cur_conf->beacon_interval) { 741 /* 742 * If we are joining an existing IBSS network, start beaconing 743 * only after a TSF-sync has taken place. Ensure that this 744 * happens by setting the appropriate flags. 745 */ 746 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 747 bss_conf->enable_beacon) { 748 spin_lock_irqsave(&sc->sc_pm_lock, flags); 749 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 750 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 751 skip_beacon = true; 752 } else { 753 ath9k_set_beacon(sc); 754 } 755 756 /* 757 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode 758 * here, it is done in ath9k_beacon_config_adhoc(). 759 */ 760 if (cur_conf->enable_beacon && !skip_beacon) 761 set_bit(SC_OP_BEACONS, &sc->sc_flags); 762 else 763 clear_bit(SC_OP_BEACONS, &sc->sc_flags); 764 } 765 } 766 767 void ath9k_set_beacon(struct ath_softc *sc) 768 { 769 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 770 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 771 772 switch (sc->sc_ah->opmode) { 773 case NL80211_IFTYPE_AP: 774 case NL80211_IFTYPE_MESH_POINT: 775 ath9k_beacon_config_ap(sc, cur_conf); 776 break; 777 case NL80211_IFTYPE_ADHOC: 778 ath9k_beacon_config_adhoc(sc, cur_conf); 779 break; 780 case NL80211_IFTYPE_STATION: 781 ath9k_beacon_config_sta(sc, cur_conf); 782 break; 783 default: 784 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 785 return; 786 } 787 } 788