beacon.c revision 3a2329f2680796b0c09ff207803ea880a481c3a4
1/* 2 * Copyright (c) 2008-2009 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 "ath9k.h" 18 19#define FUDGE 2 20 21/* 22 * This function will modify certain transmit queue properties depending on 23 * the operating mode of the station (AP or AdHoc). Parameters are AIFS 24 * settings and channel width min/max 25*/ 26int ath_beaconq_config(struct ath_softc *sc) 27{ 28 struct ath_hw *ah = sc->sc_ah; 29 struct ath_common *common = ath9k_hw_common(ah); 30 struct ath9k_tx_queue_info qi, qi_be; 31 struct ath_txq *txq; 32 33 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); 34 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 35 /* Always burst out beacon and CAB traffic. */ 36 qi.tqi_aifs = 1; 37 qi.tqi_cwmin = 0; 38 qi.tqi_cwmax = 0; 39 } else { 40 /* Adhoc mode; important thing is to use 2x cwmin. */ 41 txq = sc->tx.txq_map[WME_AC_BE]; 42 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); 43 qi.tqi_aifs = qi_be.tqi_aifs; 44 qi.tqi_cwmin = 4*qi_be.tqi_cwmin; 45 qi.tqi_cwmax = qi_be.tqi_cwmax; 46 } 47 48 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { 49 ath_err(common, 50 "Unable to update h/w beacon queue parameters\n"); 51 return 0; 52 } else { 53 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); 54 return 1; 55 } 56} 57 58/* 59 * Associates the beacon frame buffer with a transmit descriptor. Will set 60 * up all required antenna switch parameters, rate codes, and channel flags. 61 * Beacons are always sent out at the lowest rate, and are not retried. 62*/ 63static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, 64 struct ath_buf *bf, int rateidx) 65{ 66 struct sk_buff *skb = bf->bf_mpdu; 67 struct ath_hw *ah = sc->sc_ah; 68 struct ath_common *common = ath9k_hw_common(ah); 69 struct ath_desc *ds; 70 struct ath9k_11n_rate_series series[4]; 71 int flags, antenna, ctsrate = 0, ctsduration = 0; 72 struct ieee80211_supported_band *sband; 73 u8 rate = 0; 74 75 ds = bf->bf_desc; 76 flags = ATH9K_TXDESC_NOACK; 77 78 ds->ds_link = 0; 79 /* 80 * Switch antenna every beacon. 81 * Should only switch every beacon period, not for every SWBA 82 * XXX assumes two antennae 83 */ 84 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1); 85 86 sband = &sc->sbands[common->hw->conf.channel->band]; 87 rate = sband->bitrates[rateidx].hw_value; 88 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) 89 rate |= sband->bitrates[rateidx].hw_value_short; 90 91 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN, 92 ATH9K_PKT_TYPE_BEACON, 93 MAX_RATE_POWER, 94 ATH9K_TXKEYIX_INVALID, 95 ATH9K_KEY_TYPE_CLEAR, 96 flags); 97 98 /* NB: beacon's BufLen must be a multiple of 4 bytes */ 99 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4), 100 true, true, ds, bf->bf_buf_addr, 101 sc->beacon.beaconq); 102 103 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); 104 series[0].Tries = 1; 105 series[0].Rate = rate; 106 series[0].ChSel = ath_txchainmask_reduction(sc, 107 common->tx_chainmask, series[0].Rate); 108 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; 109 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration, 110 series, 4, 0); 111} 112 113static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) 114{ 115 struct ath_softc *sc = hw->priv; 116 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 117 struct ath_tx_control txctl; 118 119 memset(&txctl, 0, sizeof(struct ath_tx_control)); 120 txctl.txq = sc->beacon.cabq; 121 122 ath_dbg(common, ATH_DBG_XMIT, 123 "transmitting CABQ packet, skb: %p\n", skb); 124 125 if (ath_tx_start(hw, skb, &txctl) != 0) { 126 ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n"); 127 dev_kfree_skb_any(skb); 128 } 129} 130 131static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, 132 struct ieee80211_vif *vif) 133{ 134 struct ath_softc *sc = hw->priv; 135 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 136 struct ath_buf *bf; 137 struct ath_vif *avp; 138 struct sk_buff *skb; 139 struct ath_txq *cabq; 140 struct ieee80211_tx_info *info; 141 int cabq_depth; 142 143 avp = (void *)vif->drv_priv; 144 cabq = sc->beacon.cabq; 145 146 if (avp->av_bcbuf == NULL) 147 return NULL; 148 149 /* Release the old beacon first */ 150 151 bf = avp->av_bcbuf; 152 skb = bf->bf_mpdu; 153 if (skb) { 154 dma_unmap_single(sc->dev, bf->bf_buf_addr, 155 skb->len, DMA_TO_DEVICE); 156 dev_kfree_skb_any(skb); 157 bf->bf_buf_addr = 0; 158 } 159 160 /* Get a new beacon from mac80211 */ 161 162 skb = ieee80211_beacon_get(hw, vif); 163 bf->bf_mpdu = skb; 164 if (skb == NULL) 165 return NULL; 166 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = 167 avp->tsf_adjust; 168 169 info = IEEE80211_SKB_CB(skb); 170 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { 171 /* 172 * TODO: make sure the seq# gets assigned properly (vs. other 173 * TX frames) 174 */ 175 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 176 sc->tx.seq_no += 0x10; 177 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 178 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); 179 } 180 181 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 182 skb->len, DMA_TO_DEVICE); 183 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 184 dev_kfree_skb_any(skb); 185 bf->bf_mpdu = NULL; 186 bf->bf_buf_addr = 0; 187 ath_err(common, "dma_mapping_error on beaconing\n"); 188 return NULL; 189 } 190 191 skb = ieee80211_get_buffered_bc(hw, vif); 192 193 /* 194 * if the CABQ traffic from previous DTIM is pending and the current 195 * beacon is also a DTIM. 196 * 1) if there is only one vif let the cab traffic continue. 197 * 2) if there are more than one vif and we are using staggered 198 * beacons, then drain the cabq by dropping all the frames in 199 * the cabq so that the current vifs cab traffic can be scheduled. 200 */ 201 spin_lock_bh(&cabq->axq_lock); 202 cabq_depth = cabq->axq_depth; 203 spin_unlock_bh(&cabq->axq_lock); 204 205 if (skb && cabq_depth) { 206 if (sc->nvifs > 1) { 207 ath_dbg(common, ATH_DBG_BEACON, 208 "Flushing previous cabq traffic\n"); 209 ath_draintxq(sc, cabq, false); 210 } 211 } 212 213 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx); 214 215 while (skb) { 216 ath_tx_cabq(hw, skb); 217 skb = ieee80211_get_buffered_bc(hw, vif); 218 } 219 220 return bf; 221} 222 223int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif) 224{ 225 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 226 struct ath_vif *avp; 227 struct ath_buf *bf; 228 struct sk_buff *skb; 229 __le64 tstamp; 230 231 avp = (void *)vif->drv_priv; 232 233 /* Allocate a beacon descriptor if we haven't done so. */ 234 if (!avp->av_bcbuf) { 235 /* Allocate beacon state for hostap/ibss. We know 236 * a buffer is available. */ 237 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, 238 struct ath_buf, list); 239 list_del(&avp->av_bcbuf->list); 240 241 if (ath9k_uses_beacons(vif->type)) { 242 int slot; 243 /* 244 * Assign the vif to a beacon xmit slot. As 245 * above, this cannot fail to find one. 246 */ 247 avp->av_bslot = 0; 248 for (slot = 0; slot < ATH_BCBUF; slot++) 249 if (sc->beacon.bslot[slot] == NULL) { 250 avp->av_bslot = slot; 251 252 /* NB: keep looking for a double slot */ 253 if (slot == 0 || !sc->beacon.bslot[slot-1]) 254 break; 255 } 256 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); 257 sc->beacon.bslot[avp->av_bslot] = vif; 258 sc->nbcnvifs++; 259 } 260 } 261 262 /* release the previous beacon frame, if it already exists. */ 263 bf = avp->av_bcbuf; 264 if (bf->bf_mpdu != NULL) { 265 skb = bf->bf_mpdu; 266 dma_unmap_single(sc->dev, bf->bf_buf_addr, 267 skb->len, DMA_TO_DEVICE); 268 dev_kfree_skb_any(skb); 269 bf->bf_mpdu = NULL; 270 bf->bf_buf_addr = 0; 271 } 272 273 /* NB: the beacon data buffer must be 32-bit aligned. */ 274 skb = ieee80211_beacon_get(sc->hw, vif); 275 if (skb == NULL) 276 return -ENOMEM; 277 278 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; 279 sc->beacon.bc_tstamp = le64_to_cpu(tstamp); 280 /* Calculate a TSF adjustment factor required for staggered beacons. */ 281 if (avp->av_bslot > 0) { 282 u64 tsfadjust; 283 int intval; 284 285 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; 286 287 /* 288 * Calculate the TSF offset for this beacon slot, i.e., the 289 * number of usecs that need to be added to the timestamp field 290 * in Beacon and Probe Response frames. Beacon slot 0 is 291 * processed at the correct offset, so it does not require TSF 292 * adjustment. Other slots are adjusted to get the timestamp 293 * close to the TBTT for the BSS. 294 */ 295 tsfadjust = intval * avp->av_bslot / ATH_BCBUF; 296 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); 297 298 ath_dbg(common, ATH_DBG_BEACON, 299 "stagger beacons, bslot %d intval %u tsfadjust %llu\n", 300 avp->av_bslot, intval, (unsigned long long)tsfadjust); 301 302 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = 303 avp->tsf_adjust; 304 } else 305 avp->tsf_adjust = cpu_to_le64(0); 306 307 bf->bf_mpdu = skb; 308 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 309 skb->len, DMA_TO_DEVICE); 310 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 311 dev_kfree_skb_any(skb); 312 bf->bf_mpdu = NULL; 313 bf->bf_buf_addr = 0; 314 ath_err(common, "dma_mapping_error on beacon alloc\n"); 315 return -ENOMEM; 316 } 317 318 return 0; 319} 320 321void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) 322{ 323 if (avp->av_bcbuf != NULL) { 324 struct ath_buf *bf; 325 326 if (avp->av_bslot != -1) { 327 sc->beacon.bslot[avp->av_bslot] = NULL; 328 sc->nbcnvifs--; 329 } 330 331 bf = avp->av_bcbuf; 332 if (bf->bf_mpdu != NULL) { 333 struct sk_buff *skb = bf->bf_mpdu; 334 dma_unmap_single(sc->dev, bf->bf_buf_addr, 335 skb->len, DMA_TO_DEVICE); 336 dev_kfree_skb_any(skb); 337 bf->bf_mpdu = NULL; 338 bf->bf_buf_addr = 0; 339 } 340 list_add_tail(&bf->list, &sc->beacon.bbuf); 341 342 avp->av_bcbuf = NULL; 343 } 344} 345 346void ath_beacon_tasklet(unsigned long data) 347{ 348 struct ath_softc *sc = (struct ath_softc *)data; 349 struct ath_hw *ah = sc->sc_ah; 350 struct ath_common *common = ath9k_hw_common(ah); 351 struct ath_buf *bf = NULL; 352 struct ieee80211_vif *vif; 353 int slot; 354 u32 bfaddr, bc = 0, tsftu; 355 u64 tsf; 356 u16 intval; 357 358 /* 359 * Check if the previous beacon has gone out. If 360 * not don't try to post another, skip this period 361 * and wait for the next. Missed beacons indicate 362 * a problem and should not occur. If we miss too 363 * many consecutive beacons reset the device. 364 */ 365 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 366 sc->beacon.bmisscnt++; 367 368 if (sc->beacon.bmisscnt < BSTUCK_THRESH) { 369 ath_dbg(common, ATH_DBG_BSTUCK, 370 "missed %u consecutive beacons\n", 371 sc->beacon.bmisscnt); 372 ath9k_hw_bstuck_nfcal(ah); 373 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 374 ath_dbg(common, ATH_DBG_BSTUCK, 375 "beacon is officially stuck\n"); 376 sc->sc_flags |= SC_OP_TSF_RESET; 377 ath_reset(sc, true); 378 } 379 380 return; 381 } 382 383 if (sc->beacon.bmisscnt != 0) { 384 ath_dbg(common, ATH_DBG_BSTUCK, 385 "resume beacon xmit after %u misses\n", 386 sc->beacon.bmisscnt); 387 sc->beacon.bmisscnt = 0; 388 } 389 390 /* 391 * Generate beacon frames. we are sending frames 392 * staggered so calculate the slot for this frame based 393 * on the tsf to safeguard against missing an swba. 394 */ 395 396 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; 397 398 tsf = ath9k_hw_gettsf64(ah); 399 tsftu = TSF_TO_TU(tsf>>32, tsf); 400 slot = ((tsftu % intval) * ATH_BCBUF) / intval; 401 /* 402 * Reverse the slot order to get slot 0 on the TBTT offset that does 403 * not require TSF adjustment and other slots adding 404 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with 405 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 .. 406 * and slot 0 is at correct offset to TBTT. 407 */ 408 slot = ATH_BCBUF - slot - 1; 409 vif = sc->beacon.bslot[slot]; 410 411 ath_dbg(common, ATH_DBG_BEACON, 412 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", 413 slot, tsf, tsftu, intval, vif); 414 415 bfaddr = 0; 416 if (vif) { 417 bf = ath_beacon_generate(sc->hw, vif); 418 if (bf != NULL) { 419 bfaddr = bf->bf_daddr; 420 bc = 1; 421 } 422 } 423 424 /* 425 * Handle slot time change when a non-ERP station joins/leaves 426 * an 11g network. The 802.11 layer notifies us via callback, 427 * we mark updateslot, then wait one beacon before effecting 428 * the change. This gives associated stations at least one 429 * beacon interval to note the state change. 430 * 431 * NB: The slot time change state machine is clocked according 432 * to whether we are bursting or staggering beacons. We 433 * recognize the request to update and record the current 434 * slot then don't transition until that slot is reached 435 * again. If we miss a beacon for that slot then we'll be 436 * slow to transition but we'll be sure at least one beacon 437 * interval has passed. When bursting slot is always left 438 * set to ATH_BCBUF so this check is a noop. 439 */ 440 if (sc->beacon.updateslot == UPDATE) { 441 sc->beacon.updateslot = COMMIT; /* commit next beacon */ 442 sc->beacon.slotupdate = slot; 443 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { 444 ah->slottime = sc->beacon.slottime; 445 ath9k_hw_init_global_settings(ah); 446 sc->beacon.updateslot = OK; 447 } 448 if (bfaddr != 0) { 449 /* 450 * Stop any current dma and put the new frame(s) on the queue. 451 * This should never fail since we check above that no frames 452 * are still pending on the queue. 453 */ 454 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) { 455 ath_err(common, "beacon queue %u did not stop?\n", 456 sc->beacon.beaconq); 457 } 458 459 /* NB: cabq traffic should already be queued and primed */ 460 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); 461 ath9k_hw_txstart(ah, sc->beacon.beaconq); 462 463 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ 464 } 465} 466 467static void ath9k_beacon_init(struct ath_softc *sc, 468 u32 next_beacon, 469 u32 beacon_period) 470{ 471 if (beacon_period & ATH9K_BEACON_RESET_TSF) 472 ath9k_ps_wakeup(sc); 473 474 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period); 475 476 if (beacon_period & ATH9K_BEACON_RESET_TSF) 477 ath9k_ps_restore(sc); 478} 479 480/* 481 * For multi-bss ap support beacons are either staggered evenly over N slots or 482 * burst together. For the former arrange for the SWBA to be delivered for each 483 * slot. Slots that are not occupied will generate nothing. 484 */ 485static void ath_beacon_config_ap(struct ath_softc *sc, 486 struct ath_beacon_config *conf) 487{ 488 struct ath_hw *ah = sc->sc_ah; 489 u32 nexttbtt, intval; 490 491 /* NB: the beacon interval is kept internally in TU's */ 492 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 493 intval /= ATH_BCBUF; /* for staggered beacons */ 494 nexttbtt = intval; 495 496 if (sc->sc_flags & SC_OP_TSF_RESET) 497 intval |= ATH9K_BEACON_RESET_TSF; 498 499 /* 500 * In AP mode we enable the beacon timers and SWBA interrupts to 501 * prepare beacon frames. 502 */ 503 intval |= ATH9K_BEACON_ENA; 504 ah->imask |= ATH9K_INT_SWBA; 505 ath_beaconq_config(sc); 506 507 /* Set the computed AP beacon timers */ 508 509 ath9k_hw_disable_interrupts(ah); 510 ath9k_beacon_init(sc, nexttbtt, intval); 511 sc->beacon.bmisscnt = 0; 512 ath9k_hw_set_interrupts(ah, ah->imask); 513 514 /* Clear the reset TSF flag, so that subsequent beacon updation 515 will not reset the HW TSF. */ 516 517 sc->sc_flags &= ~SC_OP_TSF_RESET; 518} 519 520/* 521 * This sets up the beacon timers according to the timestamp of the last 522 * received beacon and the current TSF, configures PCF and DTIM 523 * handling, programs the sleep registers so the hardware will wakeup in 524 * time to receive beacons, and configures the beacon miss handling so 525 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 526 * we've associated with. 527 */ 528static void ath_beacon_config_sta(struct ath_softc *sc, 529 struct ath_beacon_config *conf) 530{ 531 struct ath_hw *ah = sc->sc_ah; 532 struct ath_common *common = ath9k_hw_common(ah); 533 struct ath9k_beacon_state bs; 534 int dtimperiod, dtimcount, sleepduration; 535 int cfpperiod, cfpcount; 536 u32 nexttbtt = 0, intval, tsftu; 537 u64 tsf; 538 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 539 540 /* No need to configure beacon if we are not associated */ 541 if (!common->curaid) { 542 ath_dbg(common, ATH_DBG_BEACON, 543 "STA is not yet associated..skipping beacon config\n"); 544 return; 545 } 546 547 memset(&bs, 0, sizeof(bs)); 548 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 549 550 /* 551 * Setup dtim and cfp parameters according to 552 * last beacon we received (which may be none). 553 */ 554 dtimperiod = conf->dtim_period; 555 dtimcount = conf->dtim_count; 556 if (dtimcount >= dtimperiod) /* NB: sanity check */ 557 dtimcount = 0; 558 cfpperiod = 1; /* NB: no PCF support yet */ 559 cfpcount = 0; 560 561 sleepduration = conf->listen_interval * intval; 562 563 /* 564 * Pull nexttbtt forward to reflect the current 565 * TSF and calculate dtim+cfp state for the result. 566 */ 567 tsf = ath9k_hw_gettsf64(ah); 568 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 569 570 num_beacons = tsftu / intval + 1; 571 offset = tsftu % intval; 572 nexttbtt = tsftu - offset; 573 if (offset) 574 nexttbtt += intval; 575 576 /* DTIM Beacon every dtimperiod Beacon */ 577 dtim_dec_count = num_beacons % dtimperiod; 578 /* CFP every cfpperiod DTIM Beacon */ 579 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 580 if (dtim_dec_count) 581 cfp_dec_count++; 582 583 dtimcount -= dtim_dec_count; 584 if (dtimcount < 0) 585 dtimcount += dtimperiod; 586 587 cfpcount -= cfp_dec_count; 588 if (cfpcount < 0) 589 cfpcount += cfpperiod; 590 591 bs.bs_intval = intval; 592 bs.bs_nexttbtt = nexttbtt; 593 bs.bs_dtimperiod = dtimperiod*intval; 594 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 595 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 596 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 597 bs.bs_cfpmaxduration = 0; 598 599 /* 600 * Calculate the number of consecutive beacons to miss* before taking 601 * a BMISS interrupt. The configuration is specified in TU so we only 602 * need calculate based on the beacon interval. Note that we clamp the 603 * result to at most 15 beacons. 604 */ 605 if (sleepduration > intval) { 606 bs.bs_bmissthreshold = conf->listen_interval * 607 ATH_DEFAULT_BMISS_LIMIT / 2; 608 } else { 609 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 610 if (bs.bs_bmissthreshold > 15) 611 bs.bs_bmissthreshold = 15; 612 else if (bs.bs_bmissthreshold <= 0) 613 bs.bs_bmissthreshold = 1; 614 } 615 616 /* 617 * Calculate sleep duration. The configuration is given in ms. 618 * We ensure a multiple of the beacon period is used. Also, if the sleep 619 * duration is greater than the DTIM period then it makes senses 620 * to make it a multiple of that. 621 * 622 * XXX fixed at 100ms 623 */ 624 625 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 626 if (bs.bs_sleepduration > bs.bs_dtimperiod) 627 bs.bs_sleepduration = bs.bs_dtimperiod; 628 629 /* TSF out of range threshold fixed at 1 second */ 630 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 631 632 ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 633 ath_dbg(common, ATH_DBG_BEACON, 634 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 635 bs.bs_bmissthreshold, bs.bs_sleepduration, 636 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 637 638 /* Set the computed STA beacon timers */ 639 640 ath9k_hw_disable_interrupts(ah); 641 ath9k_hw_set_sta_beacon_timers(ah, &bs); 642 ah->imask |= ATH9K_INT_BMISS; 643 ath9k_hw_set_interrupts(ah, ah->imask); 644} 645 646static void ath_beacon_config_adhoc(struct ath_softc *sc, 647 struct ath_beacon_config *conf) 648{ 649 struct ath_hw *ah = sc->sc_ah; 650 struct ath_common *common = ath9k_hw_common(ah); 651 u64 tsf; 652 u32 tsftu, intval, nexttbtt; 653 654 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 655 656 657 /* Pull nexttbtt forward to reflect the current TSF */ 658 659 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp); 660 if (nexttbtt == 0) 661 nexttbtt = intval; 662 else if (intval) 663 nexttbtt = roundup(nexttbtt, intval); 664 665 tsf = ath9k_hw_gettsf64(ah); 666 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE; 667 do { 668 nexttbtt += intval; 669 } while (nexttbtt < tsftu); 670 671 ath_dbg(common, ATH_DBG_BEACON, 672 "IBSS nexttbtt %u intval %u (%u)\n", 673 nexttbtt, intval, conf->beacon_interval); 674 675 /* 676 * In IBSS mode enable the beacon timers but only enable SWBA interrupts 677 * if we need to manually prepare beacon frames. Otherwise we use a 678 * self-linked tx descriptor and let the hardware deal with things. 679 */ 680 intval |= ATH9K_BEACON_ENA; 681 ah->imask |= ATH9K_INT_SWBA; 682 683 ath_beaconq_config(sc); 684 685 /* Set the computed ADHOC beacon timers */ 686 687 ath9k_hw_disable_interrupts(ah); 688 ath9k_beacon_init(sc, nexttbtt, intval); 689 sc->beacon.bmisscnt = 0; 690 ath9k_hw_set_interrupts(ah, ah->imask); 691} 692 693void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 694{ 695 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 696 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 697 enum nl80211_iftype iftype; 698 699 /* Setup the beacon configuration parameters */ 700 if (vif) { 701 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 702 iftype = vif->type; 703 cur_conf->beacon_interval = bss_conf->beacon_int; 704 cur_conf->dtim_period = bss_conf->dtim_period; 705 } else { 706 iftype = sc->sc_ah->opmode; 707 } 708 709 cur_conf->listen_interval = 1; 710 cur_conf->dtim_count = 1; 711 cur_conf->bmiss_timeout = 712 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 713 714 /* 715 * It looks like mac80211 may end up using beacon interval of zero in 716 * some cases (at least for mesh point). Avoid getting into an 717 * infinite loop by using a bit safer value instead. To be safe, 718 * do sanity check on beacon interval for all operating modes. 719 */ 720 if (cur_conf->beacon_interval == 0) 721 cur_conf->beacon_interval = 100; 722 723 /* 724 * We don't parse dtim period from mac80211 during the driver 725 * initialization as it breaks association with hidden-ssid 726 * AP and it causes latency in roaming 727 */ 728 if (cur_conf->dtim_period == 0) 729 cur_conf->dtim_period = 1; 730 731 switch (iftype) { 732 case NL80211_IFTYPE_AP: 733 ath_beacon_config_ap(sc, cur_conf); 734 break; 735 case NL80211_IFTYPE_ADHOC: 736 case NL80211_IFTYPE_MESH_POINT: 737 ath_beacon_config_adhoc(sc, cur_conf); 738 break; 739 case NL80211_IFTYPE_STATION: 740 ath_beacon_config_sta(sc, cur_conf); 741 break; 742 default: 743 ath_dbg(common, ATH_DBG_CONFIG, 744 "Unsupported beaconing mode\n"); 745 return; 746 } 747 748 sc->sc_flags |= SC_OP_BEACONS; 749} 750