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 /* Always burst out beacon and CAB traffic. */ 44 qi.tqi_aifs = 1; 45 qi.tqi_cwmin = 0; 46 qi.tqi_cwmax = 0; 47 } else { 48 /* Adhoc mode; important thing is to use 2x cwmin. */ 49 txq = sc->tx.txq_map[IEEE80211_AC_BE]; 50 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); 51 qi.tqi_aifs = qi_be.tqi_aifs; 52 if (ah->slottime == ATH9K_SLOT_TIME_20) 53 qi.tqi_cwmin = 2*qi_be.tqi_cwmin; 54 else 55 qi.tqi_cwmin = 4*qi_be.tqi_cwmin; 56 qi.tqi_cwmax = qi_be.tqi_cwmax; 57 } 58 59 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { 60 ath_err(common, "Unable to update h/w beacon queue parameters\n"); 61 } else { 62 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); 63 } 64 } 65 66 /* 67 * Associates the beacon frame buffer with a transmit descriptor. Will set 68 * up rate codes, and channel flags. Beacons are always sent out at the 69 * lowest rate, and are not retried. 70 */ 71 static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif, 72 struct ath_buf *bf, int rateidx) 73 { 74 struct sk_buff *skb = bf->bf_mpdu; 75 struct ath_hw *ah = sc->sc_ah; 76 struct ath_common *common = ath9k_hw_common(ah); 77 struct ath_tx_info info; 78 struct ieee80211_supported_band *sband; 79 u8 chainmask = ah->txchainmask; 80 u8 rate = 0; 81 82 sband = &sc->sbands[common->hw->conf.channel->band]; 83 rate = sband->bitrates[rateidx].hw_value; 84 if (vif->bss_conf.use_short_preamble) 85 rate |= sband->bitrates[rateidx].hw_value_short; 86 87 memset(&info, 0, sizeof(info)); 88 info.pkt_len = skb->len + FCS_LEN; 89 info.type = ATH9K_PKT_TYPE_BEACON; 90 info.txpower = MAX_RATE_POWER; 91 info.keyix = ATH9K_TXKEYIX_INVALID; 92 info.keytype = ATH9K_KEY_TYPE_CLEAR; 93 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK; 94 95 info.buf_addr[0] = bf->bf_buf_addr; 96 info.buf_len[0] = roundup(skb->len, 4); 97 98 info.is_first = true; 99 info.is_last = true; 100 101 info.qcu = sc->beacon.beaconq; 102 103 info.rates[0].Tries = 1; 104 info.rates[0].Rate = rate; 105 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate); 106 107 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info); 108 } 109 110 static void ath9k_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) 111 { 112 struct ath_softc *sc = hw->priv; 113 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 114 struct ath_tx_control txctl; 115 116 memset(&txctl, 0, sizeof(struct ath_tx_control)); 117 txctl.txq = sc->beacon.cabq; 118 119 ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb); 120 121 if (ath_tx_start(hw, skb, &txctl) != 0) { 122 ath_dbg(common, XMIT, "CABQ TX failed\n"); 123 ieee80211_free_txskb(hw, skb); 124 } 125 } 126 127 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw, 128 struct ieee80211_vif *vif) 129 { 130 struct ath_softc *sc = hw->priv; 131 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 132 struct ath_buf *bf; 133 struct ath_vif *avp = (void *)vif->drv_priv; 134 struct sk_buff *skb; 135 struct ath_txq *cabq = sc->beacon.cabq; 136 struct ieee80211_tx_info *info; 137 struct ieee80211_mgmt *mgmt_hdr; 138 int cabq_depth; 139 140 if (avp->av_bcbuf == NULL) 141 return NULL; 142 143 bf = avp->av_bcbuf; 144 skb = bf->bf_mpdu; 145 if (skb) { 146 dma_unmap_single(sc->dev, bf->bf_buf_addr, 147 skb->len, DMA_TO_DEVICE); 148 dev_kfree_skb_any(skb); 149 bf->bf_buf_addr = 0; 150 bf->bf_mpdu = NULL; 151 } 152 153 skb = ieee80211_beacon_get(hw, vif); 154 if (skb == NULL) 155 return NULL; 156 157 bf->bf_mpdu = skb; 158 159 mgmt_hdr = (struct ieee80211_mgmt *)skb->data; 160 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust; 161 162 info = IEEE80211_SKB_CB(skb); 163 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { 164 /* 165 * TODO: make sure the seq# gets assigned properly (vs. other 166 * TX frames) 167 */ 168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 169 sc->tx.seq_no += 0x10; 170 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 171 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); 172 } 173 174 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 175 skb->len, DMA_TO_DEVICE); 176 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 177 dev_kfree_skb_any(skb); 178 bf->bf_mpdu = NULL; 179 bf->bf_buf_addr = 0; 180 ath_err(common, "dma_mapping_error on beaconing\n"); 181 return NULL; 182 } 183 184 skb = ieee80211_get_buffered_bc(hw, vif); 185 186 /* 187 * if the CABQ traffic from previous DTIM is pending and the current 188 * beacon is also a DTIM. 189 * 1) if there is only one vif let the cab traffic continue. 190 * 2) if there are more than one vif and we are using staggered 191 * beacons, then drain the cabq by dropping all the frames in 192 * the cabq so that the current vifs cab traffic can be scheduled. 193 */ 194 spin_lock_bh(&cabq->axq_lock); 195 cabq_depth = cabq->axq_depth; 196 spin_unlock_bh(&cabq->axq_lock); 197 198 if (skb && cabq_depth) { 199 if (sc->nvifs > 1) { 200 ath_dbg(common, BEACON, 201 "Flushing previous cabq traffic\n"); 202 ath_draintxq(sc, cabq); 203 } 204 } 205 206 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); 207 208 while (skb) { 209 ath9k_tx_cabq(hw, skb); 210 skb = ieee80211_get_buffered_bc(hw, vif); 211 } 212 213 return bf; 214 } 215 216 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 217 { 218 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 219 struct ath_vif *avp = (void *)vif->drv_priv; 220 int slot; 221 222 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); 223 list_del(&avp->av_bcbuf->list); 224 225 for (slot = 0; slot < ATH_BCBUF; slot++) { 226 if (sc->beacon.bslot[slot] == NULL) { 227 avp->av_bslot = slot; 228 break; 229 } 230 } 231 232 sc->beacon.bslot[avp->av_bslot] = vif; 233 sc->nbcnvifs++; 234 235 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", 236 avp->av_bslot); 237 } 238 239 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 240 { 241 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 242 struct ath_vif *avp = (void *)vif->drv_priv; 243 struct ath_buf *bf = avp->av_bcbuf; 244 245 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", 246 avp->av_bslot); 247 248 tasklet_disable(&sc->bcon_tasklet); 249 250 if (bf && bf->bf_mpdu) { 251 struct sk_buff *skb = bf->bf_mpdu; 252 dma_unmap_single(sc->dev, bf->bf_buf_addr, 253 skb->len, DMA_TO_DEVICE); 254 dev_kfree_skb_any(skb); 255 bf->bf_mpdu = NULL; 256 bf->bf_buf_addr = 0; 257 } 258 259 avp->av_bcbuf = NULL; 260 sc->beacon.bslot[avp->av_bslot] = NULL; 261 sc->nbcnvifs--; 262 list_add_tail(&bf->list, &sc->beacon.bbuf); 263 264 tasklet_enable(&sc->bcon_tasklet); 265 } 266 267 static int ath9k_beacon_choose_slot(struct ath_softc *sc) 268 { 269 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 270 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 271 u16 intval; 272 u32 tsftu; 273 u64 tsf; 274 int slot; 275 276 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP) { 277 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", 278 ath9k_hw_gettsf64(sc->sc_ah)); 279 return 0; 280 } 281 282 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; 283 tsf = ath9k_hw_gettsf64(sc->sc_ah); 284 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); 285 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); 286 slot = (tsftu % (intval * ATH_BCBUF)) / intval; 287 288 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", 289 slot, tsf, tsftu / ATH_BCBUF); 290 291 return slot; 292 } 293 294 void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) 295 { 296 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 297 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 298 struct ath_vif *avp = (void *)vif->drv_priv; 299 u64 tsfadjust; 300 301 if (avp->av_bslot == 0) 302 return; 303 304 tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF; 305 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); 306 307 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", 308 (unsigned long long)tsfadjust, avp->av_bslot); 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 if (!ath9k_hw_check_alive(ah)) 338 ieee80211_queue_work(sc->hw, &sc->hw_check_work); 339 340 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 341 ath_dbg(common, BSTUCK, 342 "missed %u consecutive beacons\n", 343 sc->beacon.bmisscnt); 344 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 345 if (sc->beacon.bmisscnt > 3) 346 ath9k_hw_bstuck_nfcal(ah); 347 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 348 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 349 sc->beacon.bmisscnt = 0; 350 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 351 } 352 353 return; 354 } 355 356 slot = ath9k_beacon_choose_slot(sc); 357 vif = sc->beacon.bslot[slot]; 358 359 if (!vif || !vif->bss_conf.enable_beacon) 360 return; 361 362 bf = ath9k_beacon_generate(sc->hw, vif); 363 364 if (sc->beacon.bmisscnt != 0) { 365 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 366 sc->beacon.bmisscnt); 367 sc->beacon.bmisscnt = 0; 368 } 369 370 /* 371 * Handle slot time change when a non-ERP station joins/leaves 372 * an 11g network. The 802.11 layer notifies us via callback, 373 * we mark updateslot, then wait one beacon before effecting 374 * the change. This gives associated stations at least one 375 * beacon interval to note the state change. 376 * 377 * NB: The slot time change state machine is clocked according 378 * to whether we are bursting or staggering beacons. We 379 * recognize the request to update and record the current 380 * slot then don't transition until that slot is reached 381 * again. If we miss a beacon for that slot then we'll be 382 * slow to transition but we'll be sure at least one beacon 383 * interval has passed. When bursting slot is always left 384 * set to ATH_BCBUF so this check is a noop. 385 */ 386 if (sc->beacon.updateslot == UPDATE) { 387 sc->beacon.updateslot = COMMIT; 388 sc->beacon.slotupdate = slot; 389 } else if (sc->beacon.updateslot == COMMIT && 390 sc->beacon.slotupdate == slot) { 391 ah->slottime = sc->beacon.slottime; 392 ath9k_hw_init_global_settings(ah); 393 sc->beacon.updateslot = OK; 394 } 395 396 if (bf) { 397 ath9k_reset_beacon_status(sc); 398 399 ath_dbg(common, BEACON, 400 "Transmitting beacon for slot: %d\n", slot); 401 402 /* NB: cabq traffic should already be queued and primed */ 403 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 404 405 if (!edma) 406 ath9k_hw_txstart(ah, sc->beacon.beaconq); 407 } 408 } 409 410 /* 411 * Both nexttbtt and intval have to be in usecs. 412 */ 413 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 414 u32 intval, bool reset_tsf) 415 { 416 struct ath_hw *ah = sc->sc_ah; 417 418 ath9k_hw_disable_interrupts(ah); 419 if (reset_tsf) 420 ath9k_hw_reset_tsf(ah); 421 ath9k_beaconq_config(sc); 422 ath9k_hw_beaconinit(ah, nexttbtt, intval); 423 sc->beacon.bmisscnt = 0; 424 ath9k_hw_set_interrupts(ah); 425 ath9k_hw_enable_interrupts(ah); 426 } 427 428 /* 429 * For multi-bss ap support beacons are either staggered evenly over N slots or 430 * burst together. For the former arrange for the SWBA to be delivered for each 431 * slot. Slots that are not occupied will generate nothing. 432 */ 433 static void ath9k_beacon_config_ap(struct ath_softc *sc, 434 struct ath_beacon_config *conf) 435 { 436 struct ath_hw *ah = sc->sc_ah; 437 struct ath_common *common = ath9k_hw_common(ah); 438 u32 nexttbtt, intval; 439 440 /* NB: the beacon interval is kept internally in TU's */ 441 intval = TU_TO_USEC(conf->beacon_interval); 442 intval /= ATH_BCBUF; 443 nexttbtt = intval; 444 445 if (conf->enable_beacon) 446 ah->imask |= ATH9K_INT_SWBA; 447 else 448 ah->imask &= ~ATH9K_INT_SWBA; 449 450 ath_dbg(common, BEACON, 451 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 452 (conf->enable_beacon) ? "Enable" : "Disable", 453 nexttbtt, intval, conf->beacon_interval); 454 455 ath9k_beacon_init(sc, nexttbtt, intval, true); 456 } 457 458 /* 459 * This sets up the beacon timers according to the timestamp of the last 460 * received beacon and the current TSF, configures PCF and DTIM 461 * handling, programs the sleep registers so the hardware will wakeup in 462 * time to receive beacons, and configures the beacon miss handling so 463 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 464 * we've associated with. 465 */ 466 static void ath9k_beacon_config_sta(struct ath_softc *sc, 467 struct ath_beacon_config *conf) 468 { 469 struct ath_hw *ah = sc->sc_ah; 470 struct ath_common *common = ath9k_hw_common(ah); 471 struct ath9k_beacon_state bs; 472 int dtimperiod, dtimcount, sleepduration; 473 int cfpperiod, cfpcount; 474 u32 nexttbtt = 0, intval, tsftu; 475 u64 tsf; 476 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 477 478 /* No need to configure beacon if we are not associated */ 479 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { 480 ath_dbg(common, BEACON, 481 "STA is not yet associated..skipping beacon config\n"); 482 return; 483 } 484 485 memset(&bs, 0, sizeof(bs)); 486 intval = conf->beacon_interval; 487 488 /* 489 * Setup dtim and cfp parameters according to 490 * last beacon we received (which may be none). 491 */ 492 dtimperiod = conf->dtim_period; 493 dtimcount = conf->dtim_count; 494 if (dtimcount >= dtimperiod) /* NB: sanity check */ 495 dtimcount = 0; 496 cfpperiod = 1; /* NB: no PCF support yet */ 497 cfpcount = 0; 498 499 sleepduration = conf->listen_interval * intval; 500 501 /* 502 * Pull nexttbtt forward to reflect the current 503 * TSF and calculate dtim+cfp state for the result. 504 */ 505 tsf = ath9k_hw_gettsf64(ah); 506 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 507 508 num_beacons = tsftu / intval + 1; 509 offset = tsftu % intval; 510 nexttbtt = tsftu - offset; 511 if (offset) 512 nexttbtt += intval; 513 514 /* DTIM Beacon every dtimperiod Beacon */ 515 dtim_dec_count = num_beacons % dtimperiod; 516 /* CFP every cfpperiod DTIM Beacon */ 517 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 518 if (dtim_dec_count) 519 cfp_dec_count++; 520 521 dtimcount -= dtim_dec_count; 522 if (dtimcount < 0) 523 dtimcount += dtimperiod; 524 525 cfpcount -= cfp_dec_count; 526 if (cfpcount < 0) 527 cfpcount += cfpperiod; 528 529 bs.bs_intval = intval; 530 bs.bs_nexttbtt = nexttbtt; 531 bs.bs_dtimperiod = dtimperiod*intval; 532 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 533 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 534 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 535 bs.bs_cfpmaxduration = 0; 536 537 /* 538 * Calculate the number of consecutive beacons to miss* before taking 539 * a BMISS interrupt. The configuration is specified in TU so we only 540 * need calculate based on the beacon interval. Note that we clamp the 541 * result to at most 15 beacons. 542 */ 543 if (sleepduration > intval) { 544 bs.bs_bmissthreshold = conf->listen_interval * 545 ATH_DEFAULT_BMISS_LIMIT / 2; 546 } else { 547 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 548 if (bs.bs_bmissthreshold > 15) 549 bs.bs_bmissthreshold = 15; 550 else if (bs.bs_bmissthreshold <= 0) 551 bs.bs_bmissthreshold = 1; 552 } 553 554 /* 555 * Calculate sleep duration. The configuration is given in ms. 556 * We ensure a multiple of the beacon period is used. Also, if the sleep 557 * duration is greater than the DTIM period then it makes senses 558 * to make it a multiple of that. 559 * 560 * XXX fixed at 100ms 561 */ 562 563 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 564 if (bs.bs_sleepduration > bs.bs_dtimperiod) 565 bs.bs_sleepduration = bs.bs_dtimperiod; 566 567 /* TSF out of range threshold fixed at 1 second */ 568 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 569 570 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 571 ath_dbg(common, BEACON, 572 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 573 bs.bs_bmissthreshold, bs.bs_sleepduration, 574 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 575 576 /* Set the computed STA beacon timers */ 577 578 ath9k_hw_disable_interrupts(ah); 579 ath9k_hw_set_sta_beacon_timers(ah, &bs); 580 ah->imask |= ATH9K_INT_BMISS; 581 582 ath9k_hw_set_interrupts(ah); 583 ath9k_hw_enable_interrupts(ah); 584 } 585 586 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 587 struct ath_beacon_config *conf) 588 { 589 struct ath_hw *ah = sc->sc_ah; 590 struct ath_common *common = ath9k_hw_common(ah); 591 u32 intval, nexttbtt; 592 593 ath9k_reset_beacon_status(sc); 594 595 intval = TU_TO_USEC(conf->beacon_interval); 596 597 if (conf->ibss_creator) { 598 nexttbtt = intval; 599 } else { 600 u32 tbtt, offset, tsftu; 601 u64 tsf; 602 603 /* 604 * Pull nexttbtt forward to reflect the current 605 * sync'd TSF. 606 */ 607 tsf = ath9k_hw_gettsf64(ah); 608 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE; 609 offset = tsftu % conf->beacon_interval; 610 tbtt = tsftu - offset; 611 if (offset) 612 tbtt += conf->beacon_interval; 613 614 nexttbtt = TU_TO_USEC(tbtt); 615 } 616 617 if (conf->enable_beacon) 618 ah->imask |= ATH9K_INT_SWBA; 619 else 620 ah->imask &= ~ATH9K_INT_SWBA; 621 622 ath_dbg(common, BEACON, 623 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 624 (conf->enable_beacon) ? "Enable" : "Disable", 625 nexttbtt, intval, conf->beacon_interval); 626 627 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); 628 629 /* 630 * Set the global 'beacon has been configured' flag for the 631 * joiner case in IBSS mode. 632 */ 633 if (!conf->ibss_creator && conf->enable_beacon) 634 set_bit(SC_OP_BEACONS, &sc->sc_flags); 635 } 636 637 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 638 { 639 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 640 struct ath_vif *avp = (void *)vif->drv_priv; 641 642 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 643 if ((vif->type != NL80211_IFTYPE_AP) || 644 (sc->nbcnvifs > 1)) { 645 ath_dbg(common, CONFIG, 646 "An AP interface is already present !\n"); 647 return false; 648 } 649 } 650 651 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 652 if ((vif->type == NL80211_IFTYPE_STATION) && 653 test_bit(SC_OP_BEACONS, &sc->sc_flags) && 654 !avp->primary_sta_vif) { 655 ath_dbg(common, CONFIG, 656 "Beacon already configured for a station interface\n"); 657 return false; 658 } 659 } 660 661 return true; 662 } 663 664 static void ath9k_cache_beacon_config(struct ath_softc *sc, 665 struct ieee80211_bss_conf *bss_conf) 666 { 667 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 668 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 669 670 ath_dbg(common, BEACON, 671 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 672 673 cur_conf->beacon_interval = bss_conf->beacon_int; 674 cur_conf->dtim_period = bss_conf->dtim_period; 675 cur_conf->listen_interval = 1; 676 cur_conf->dtim_count = 1; 677 cur_conf->ibss_creator = bss_conf->ibss_creator; 678 cur_conf->bmiss_timeout = 679 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 680 681 /* 682 * It looks like mac80211 may end up using beacon interval of zero in 683 * some cases (at least for mesh point). Avoid getting into an 684 * infinite loop by using a bit safer value instead. To be safe, 685 * do sanity check on beacon interval for all operating modes. 686 */ 687 if (cur_conf->beacon_interval == 0) 688 cur_conf->beacon_interval = 100; 689 690 /* 691 * We don't parse dtim period from mac80211 during the driver 692 * initialization as it breaks association with hidden-ssid 693 * AP and it causes latency in roaming 694 */ 695 if (cur_conf->dtim_period == 0) 696 cur_conf->dtim_period = 1; 697 698 } 699 700 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 701 u32 changed) 702 { 703 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 704 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 705 unsigned long flags; 706 bool skip_beacon = false; 707 708 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 709 ath9k_cache_beacon_config(sc, bss_conf); 710 ath9k_set_beacon(sc); 711 set_bit(SC_OP_BEACONS, &sc->sc_flags); 712 return; 713 714 } 715 716 /* 717 * Take care of multiple interfaces when 718 * enabling/disabling SWBA. 719 */ 720 if (changed & BSS_CHANGED_BEACON_ENABLED) { 721 if (!bss_conf->enable_beacon && 722 (sc->nbcnvifs <= 1)) { 723 cur_conf->enable_beacon = false; 724 } else if (bss_conf->enable_beacon) { 725 cur_conf->enable_beacon = true; 726 ath9k_cache_beacon_config(sc, bss_conf); 727 } 728 } 729 730 /* 731 * Configure the HW beacon registers only when we have a valid 732 * beacon interval. 733 */ 734 if (cur_conf->beacon_interval) { 735 /* 736 * If we are joining an existing IBSS network, start beaconing 737 * only after a TSF-sync has taken place. Ensure that this 738 * happens by setting the appropriate flags. 739 */ 740 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 741 bss_conf->enable_beacon) { 742 spin_lock_irqsave(&sc->sc_pm_lock, flags); 743 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 744 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 745 skip_beacon = true; 746 } else { 747 ath9k_set_beacon(sc); 748 } 749 750 /* 751 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode 752 * here, it is done in ath9k_beacon_config_adhoc(). 753 */ 754 if (cur_conf->enable_beacon && !skip_beacon) 755 set_bit(SC_OP_BEACONS, &sc->sc_flags); 756 else 757 clear_bit(SC_OP_BEACONS, &sc->sc_flags); 758 } 759 } 760 761 void ath9k_set_beacon(struct ath_softc *sc) 762 { 763 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 764 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 765 766 switch (sc->sc_ah->opmode) { 767 case NL80211_IFTYPE_AP: 768 ath9k_beacon_config_ap(sc, cur_conf); 769 break; 770 case NL80211_IFTYPE_ADHOC: 771 case NL80211_IFTYPE_MESH_POINT: 772 ath9k_beacon_config_adhoc(sc, cur_conf); 773 break; 774 case NL80211_IFTYPE_STATION: 775 ath9k_beacon_config_sta(sc, cur_conf); 776 break; 777 default: 778 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 779 return; 780 } 781 } 782