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 */ 26 static int ath_beaconq_config(struct ath_softc *sc) 27 { 28 struct ath_hw *ah = sc->sc_ah; 29 struct ath9k_tx_queue_info qi; 30 31 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); 32 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 33 /* Always burst out beacon and CAB traffic. */ 34 qi.tqi_aifs = 1; 35 qi.tqi_cwmin = 0; 36 qi.tqi_cwmax = 0; 37 } else { 38 /* Adhoc mode; important thing is to use 2x cwmin. */ 39 qi.tqi_aifs = sc->beacon.beacon_qi.tqi_aifs; 40 qi.tqi_cwmin = 2*sc->beacon.beacon_qi.tqi_cwmin; 41 qi.tqi_cwmax = sc->beacon.beacon_qi.tqi_cwmax; 42 } 43 44 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { 45 DPRINTF(sc, ATH_DBG_FATAL, 46 "Unable to update h/w beacon queue parameters\n"); 47 return 0; 48 } else { 49 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); 50 return 1; 51 } 52 } 53 54 /* 55 * Associates the beacon frame buffer with a transmit descriptor. Will set 56 * up all required antenna switch parameters, rate codes, and channel flags. 57 * Beacons are always sent out at the lowest rate, and are not retried. 58 */ 59 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, 60 struct ath_buf *bf) 61 { 62 struct sk_buff *skb = bf->bf_mpdu; 63 struct ath_hw *ah = sc->sc_ah; 64 struct ath_desc *ds; 65 struct ath9k_11n_rate_series series[4]; 66 const struct ath_rate_table *rt; 67 int flags, antenna, ctsrate = 0, ctsduration = 0; 68 u8 rate; 69 70 ds = bf->bf_desc; 71 flags = ATH9K_TXDESC_NOACK; 72 73 if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) || 74 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) && 75 (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { 76 ds->ds_link = bf->bf_daddr; /* self-linked */ 77 flags |= ATH9K_TXDESC_VEOL; 78 /* Let hardware handle antenna switching. */ 79 antenna = 0; 80 } else { 81 ds->ds_link = 0; 82 /* 83 * Switch antenna every beacon. 84 * Should only switch every beacon period, not for every SWBA 85 * XXX assumes two antennae 86 */ 87 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1); 88 } 89 90 ds->ds_data = bf->bf_buf_addr; 91 92 rt = sc->cur_rate_table; 93 rate = rt->info[0].ratecode; 94 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) 95 rate |= rt->info[0].short_preamble; 96 97 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN, 98 ATH9K_PKT_TYPE_BEACON, 99 MAX_RATE_POWER, 100 ATH9K_TXKEYIX_INVALID, 101 ATH9K_KEY_TYPE_CLEAR, 102 flags); 103 104 /* NB: beacon's BufLen must be a multiple of 4 bytes */ 105 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4), 106 true, true, ds); 107 108 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); 109 series[0].Tries = 1; 110 series[0].Rate = rate; 111 series[0].ChSel = sc->tx_chainmask; 112 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; 113 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration, 114 series, 4, 0); 115 } 116 117 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, 118 struct ieee80211_vif *vif) 119 { 120 struct ath_wiphy *aphy = hw->priv; 121 struct ath_softc *sc = aphy->sc; 122 struct ath_buf *bf; 123 struct ath_vif *avp; 124 struct sk_buff *skb; 125 struct ath_txq *cabq; 126 struct ieee80211_tx_info *info; 127 int cabq_depth; 128 129 if (aphy->state != ATH_WIPHY_ACTIVE) 130 return NULL; 131 132 avp = (void *)vif->drv_priv; 133 cabq = sc->beacon.cabq; 134 135 if (avp->av_bcbuf == NULL) 136 return NULL; 137 138 /* Release the old beacon first */ 139 140 bf = avp->av_bcbuf; 141 skb = bf->bf_mpdu; 142 if (skb) { 143 dma_unmap_single(sc->dev, bf->bf_dmacontext, 144 skb->len, DMA_TO_DEVICE); 145 dev_kfree_skb_any(skb); 146 } 147 148 /* Get a new beacon from mac80211 */ 149 150 skb = ieee80211_beacon_get(hw, vif); 151 bf->bf_mpdu = skb; 152 if (skb == NULL) 153 return NULL; 154 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = 155 avp->tsf_adjust; 156 157 info = IEEE80211_SKB_CB(skb); 158 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { 159 /* 160 * TODO: make sure the seq# gets assigned properly (vs. other 161 * TX frames) 162 */ 163 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 164 sc->tx.seq_no += 0x10; 165 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 166 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); 167 } 168 169 bf->bf_buf_addr = bf->bf_dmacontext = 170 dma_map_single(sc->dev, skb->data, 171 skb->len, DMA_TO_DEVICE); 172 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 173 dev_kfree_skb_any(skb); 174 bf->bf_mpdu = NULL; 175 DPRINTF(sc, ATH_DBG_FATAL, "dma_mapping_error on beaconing\n"); 176 return NULL; 177 } 178 179 skb = ieee80211_get_buffered_bc(hw, vif); 180 181 /* 182 * if the CABQ traffic from previous DTIM is pending and the current 183 * beacon is also a DTIM. 184 * 1) if there is only one vif let the cab traffic continue. 185 * 2) if there are more than one vif and we are using staggered 186 * beacons, then drain the cabq by dropping all the frames in 187 * the cabq so that the current vifs cab traffic can be scheduled. 188 */ 189 spin_lock_bh(&cabq->axq_lock); 190 cabq_depth = cabq->axq_depth; 191 spin_unlock_bh(&cabq->axq_lock); 192 193 if (skb && cabq_depth) { 194 if (sc->nvifs > 1) { 195 DPRINTF(sc, ATH_DBG_BEACON, 196 "Flushing previous cabq traffic\n"); 197 ath_draintxq(sc, cabq, false); 198 } 199 } 200 201 ath_beacon_setup(sc, avp, bf); 202 203 while (skb) { 204 ath_tx_cabq(hw, skb); 205 skb = ieee80211_get_buffered_bc(hw, vif); 206 } 207 208 return bf; 209 } 210 211 /* 212 * Startup beacon transmission for adhoc mode when they are sent entirely 213 * by the hardware using the self-linked descriptor + veol trick. 214 */ 215 static void ath_beacon_start_adhoc(struct ath_softc *sc, 216 struct ieee80211_vif *vif) 217 { 218 struct ath_hw *ah = sc->sc_ah; 219 struct ath_buf *bf; 220 struct ath_vif *avp; 221 struct sk_buff *skb; 222 223 avp = (void *)vif->drv_priv; 224 225 if (avp->av_bcbuf == NULL) 226 return; 227 228 bf = avp->av_bcbuf; 229 skb = bf->bf_mpdu; 230 231 ath_beacon_setup(sc, avp, bf); 232 233 /* NB: caller is known to have already stopped tx dma */ 234 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 235 ath9k_hw_txstart(ah, sc->beacon.beaconq); 236 DPRINTF(sc, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n", 237 sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc); 238 } 239 240 int ath_beaconq_setup(struct ath_hw *ah) 241 { 242 struct ath9k_tx_queue_info qi; 243 244 memset(&qi, 0, sizeof(qi)); 245 qi.tqi_aifs = 1; 246 qi.tqi_cwmin = 0; 247 qi.tqi_cwmax = 0; 248 /* NB: don't enable any interrupts */ 249 return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi); 250 } 251 252 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif) 253 { 254 struct ath_softc *sc = aphy->sc; 255 struct ath_vif *avp; 256 struct ath_buf *bf; 257 struct sk_buff *skb; 258 __le64 tstamp; 259 260 avp = (void *)vif->drv_priv; 261 262 /* Allocate a beacon descriptor if we haven't done so. */ 263 if (!avp->av_bcbuf) { 264 /* Allocate beacon state for hostap/ibss. We know 265 * a buffer is available. */ 266 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, 267 struct ath_buf, list); 268 list_del(&avp->av_bcbuf->list); 269 270 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP || 271 !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { 272 int slot; 273 /* 274 * Assign the vif to a beacon xmit slot. As 275 * above, this cannot fail to find one. 276 */ 277 avp->av_bslot = 0; 278 for (slot = 0; slot < ATH_BCBUF; slot++) 279 if (sc->beacon.bslot[slot] == NULL) { 280 /* 281 * XXX hack, space out slots to better 282 * deal with misses 283 */ 284 if (slot+1 < ATH_BCBUF && 285 sc->beacon.bslot[slot+1] == NULL) { 286 avp->av_bslot = slot+1; 287 break; 288 } 289 avp->av_bslot = slot; 290 /* NB: keep looking for a double slot */ 291 } 292 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); 293 sc->beacon.bslot[avp->av_bslot] = vif; 294 sc->beacon.bslot_aphy[avp->av_bslot] = aphy; 295 sc->nbcnvifs++; 296 } 297 } 298 299 /* release the previous beacon frame, if it already exists. */ 300 bf = avp->av_bcbuf; 301 if (bf->bf_mpdu != NULL) { 302 skb = bf->bf_mpdu; 303 dma_unmap_single(sc->dev, bf->bf_dmacontext, 304 skb->len, DMA_TO_DEVICE); 305 dev_kfree_skb_any(skb); 306 bf->bf_mpdu = NULL; 307 } 308 309 /* NB: the beacon data buffer must be 32-bit aligned. */ 310 skb = ieee80211_beacon_get(sc->hw, vif); 311 if (skb == NULL) { 312 DPRINTF(sc, ATH_DBG_BEACON, "cannot get skb\n"); 313 return -ENOMEM; 314 } 315 316 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; 317 sc->beacon.bc_tstamp = le64_to_cpu(tstamp); 318 /* Calculate a TSF adjustment factor required for staggered beacons. */ 319 if (avp->av_bslot > 0) { 320 u64 tsfadjust; 321 int intval; 322 323 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; 324 325 /* 326 * Calculate the TSF offset for this beacon slot, i.e., the 327 * number of usecs that need to be added to the timestamp field 328 * in Beacon and Probe Response frames. Beacon slot 0 is 329 * processed at the correct offset, so it does not require TSF 330 * adjustment. Other slots are adjusted to get the timestamp 331 * close to the TBTT for the BSS. 332 */ 333 tsfadjust = intval * avp->av_bslot / ATH_BCBUF; 334 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); 335 336 DPRINTF(sc, ATH_DBG_BEACON, 337 "stagger beacons, bslot %d intval %u tsfadjust %llu\n", 338 avp->av_bslot, intval, (unsigned long long)tsfadjust); 339 340 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = 341 avp->tsf_adjust; 342 } else 343 avp->tsf_adjust = cpu_to_le64(0); 344 345 bf->bf_mpdu = skb; 346 bf->bf_buf_addr = bf->bf_dmacontext = 347 dma_map_single(sc->dev, skb->data, 348 skb->len, DMA_TO_DEVICE); 349 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 350 dev_kfree_skb_any(skb); 351 bf->bf_mpdu = NULL; 352 DPRINTF(sc, ATH_DBG_FATAL, 353 "dma_mapping_error on beacon alloc\n"); 354 return -ENOMEM; 355 } 356 357 return 0; 358 } 359 360 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) 361 { 362 if (avp->av_bcbuf != NULL) { 363 struct ath_buf *bf; 364 365 if (avp->av_bslot != -1) { 366 sc->beacon.bslot[avp->av_bslot] = NULL; 367 sc->beacon.bslot_aphy[avp->av_bslot] = NULL; 368 sc->nbcnvifs--; 369 } 370 371 bf = avp->av_bcbuf; 372 if (bf->bf_mpdu != NULL) { 373 struct sk_buff *skb = bf->bf_mpdu; 374 dma_unmap_single(sc->dev, bf->bf_dmacontext, 375 skb->len, DMA_TO_DEVICE); 376 dev_kfree_skb_any(skb); 377 bf->bf_mpdu = NULL; 378 } 379 list_add_tail(&bf->list, &sc->beacon.bbuf); 380 381 avp->av_bcbuf = NULL; 382 } 383 } 384 385 void ath_beacon_tasklet(unsigned long data) 386 { 387 struct ath_softc *sc = (struct ath_softc *)data; 388 struct ath_hw *ah = sc->sc_ah; 389 struct ath_buf *bf = NULL; 390 struct ieee80211_vif *vif; 391 struct ath_wiphy *aphy; 392 int slot; 393 u32 bfaddr, bc = 0, tsftu; 394 u64 tsf; 395 u16 intval; 396 397 /* 398 * Check if the previous beacon has gone out. If 399 * not don't try to post another, skip this period 400 * and wait for the next. Missed beacons indicate 401 * a problem and should not occur. If we miss too 402 * many consecutive beacons reset the device. 403 */ 404 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 405 sc->beacon.bmisscnt++; 406 407 if (sc->beacon.bmisscnt < BSTUCK_THRESH) { 408 DPRINTF(sc, ATH_DBG_BEACON, 409 "missed %u consecutive beacons\n", 410 sc->beacon.bmisscnt); 411 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 412 DPRINTF(sc, ATH_DBG_BEACON, 413 "beacon is officially stuck\n"); 414 sc->sc_flags |= SC_OP_TSF_RESET; 415 ath_reset(sc, false); 416 } 417 418 return; 419 } 420 421 if (sc->beacon.bmisscnt != 0) { 422 DPRINTF(sc, ATH_DBG_BEACON, 423 "resume beacon xmit after %u misses\n", 424 sc->beacon.bmisscnt); 425 sc->beacon.bmisscnt = 0; 426 } 427 428 /* 429 * Generate beacon frames. we are sending frames 430 * staggered so calculate the slot for this frame based 431 * on the tsf to safeguard against missing an swba. 432 */ 433 434 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; 435 436 tsf = ath9k_hw_gettsf64(ah); 437 tsftu = TSF_TO_TU(tsf>>32, tsf); 438 slot = ((tsftu % intval) * ATH_BCBUF) / intval; 439 /* 440 * Reverse the slot order to get slot 0 on the TBTT offset that does 441 * not require TSF adjustment and other slots adding 442 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with 443 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 .. 444 * and slot 0 is at correct offset to TBTT. 445 */ 446 slot = ATH_BCBUF - slot - 1; 447 vif = sc->beacon.bslot[slot]; 448 aphy = sc->beacon.bslot_aphy[slot]; 449 450 DPRINTF(sc, ATH_DBG_BEACON, 451 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", 452 slot, tsf, tsftu, intval, vif); 453 454 bfaddr = 0; 455 if (vif) { 456 bf = ath_beacon_generate(aphy->hw, vif); 457 if (bf != NULL) { 458 bfaddr = bf->bf_daddr; 459 bc = 1; 460 } 461 } 462 463 /* 464 * Handle slot time change when a non-ERP station joins/leaves 465 * an 11g network. The 802.11 layer notifies us via callback, 466 * we mark updateslot, then wait one beacon before effecting 467 * the change. This gives associated stations at least one 468 * beacon interval to note the state change. 469 * 470 * NB: The slot time change state machine is clocked according 471 * to whether we are bursting or staggering beacons. We 472 * recognize the request to update and record the current 473 * slot then don't transition until that slot is reached 474 * again. If we miss a beacon for that slot then we'll be 475 * slow to transition but we'll be sure at least one beacon 476 * interval has passed. When bursting slot is always left 477 * set to ATH_BCBUF so this check is a noop. 478 */ 479 if (sc->beacon.updateslot == UPDATE) { 480 sc->beacon.updateslot = COMMIT; /* commit next beacon */ 481 sc->beacon.slotupdate = slot; 482 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { 483 ath9k_hw_setslottime(sc->sc_ah, sc->beacon.slottime); 484 sc->beacon.updateslot = OK; 485 } 486 if (bfaddr != 0) { 487 /* 488 * Stop any current dma and put the new frame(s) on the queue. 489 * This should never fail since we check above that no frames 490 * are still pending on the queue. 491 */ 492 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) { 493 DPRINTF(sc, ATH_DBG_FATAL, 494 "beacon queue %u did not stop?\n", sc->beacon.beaconq); 495 } 496 497 /* NB: cabq traffic should already be queued and primed */ 498 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); 499 ath9k_hw_txstart(ah, sc->beacon.beaconq); 500 501 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ 502 } 503 } 504 505 /* 506 * For multi-bss ap support beacons are either staggered evenly over N slots or 507 * burst together. For the former arrange for the SWBA to be delivered for each 508 * slot. Slots that are not occupied will generate nothing. 509 */ 510 static void ath_beacon_config_ap(struct ath_softc *sc, 511 struct ath_beacon_config *conf) 512 { 513 u32 nexttbtt, intval; 514 515 /* Configure the timers only when the TSF has to be reset */ 516 517 if (!(sc->sc_flags & SC_OP_TSF_RESET)) 518 return; 519 520 /* NB: the beacon interval is kept internally in TU's */ 521 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 522 intval /= ATH_BCBUF; /* for staggered beacons */ 523 nexttbtt = intval; 524 intval |= ATH9K_BEACON_RESET_TSF; 525 526 /* 527 * In AP mode we enable the beacon timers and SWBA interrupts to 528 * prepare beacon frames. 529 */ 530 intval |= ATH9K_BEACON_ENA; 531 sc->imask |= ATH9K_INT_SWBA; 532 ath_beaconq_config(sc); 533 534 /* Set the computed AP beacon timers */ 535 536 ath9k_hw_set_interrupts(sc->sc_ah, 0); 537 ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval); 538 sc->beacon.bmisscnt = 0; 539 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); 540 541 /* Clear the reset TSF flag, so that subsequent beacon updation 542 will not reset the HW TSF. */ 543 544 sc->sc_flags &= ~SC_OP_TSF_RESET; 545 } 546 547 /* 548 * This sets up the beacon timers according to the timestamp of the last 549 * received beacon and the current TSF, configures PCF and DTIM 550 * handling, programs the sleep registers so the hardware will wakeup in 551 * time to receive beacons, and configures the beacon miss handling so 552 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 553 * we've associated with. 554 */ 555 static void ath_beacon_config_sta(struct ath_softc *sc, 556 struct ath_beacon_config *conf) 557 { 558 struct ath9k_beacon_state bs; 559 int dtimperiod, dtimcount, sleepduration; 560 int cfpperiod, cfpcount; 561 u32 nexttbtt = 0, intval, tsftu; 562 u64 tsf; 563 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 564 565 memset(&bs, 0, sizeof(bs)); 566 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 567 568 /* 569 * Setup dtim and cfp parameters according to 570 * last beacon we received (which may be none). 571 */ 572 dtimperiod = conf->dtim_period; 573 if (dtimperiod <= 0) /* NB: 0 if not known */ 574 dtimperiod = 1; 575 dtimcount = conf->dtim_count; 576 if (dtimcount >= dtimperiod) /* NB: sanity check */ 577 dtimcount = 0; 578 cfpperiod = 1; /* NB: no PCF support yet */ 579 cfpcount = 0; 580 581 sleepduration = conf->listen_interval * intval; 582 if (sleepduration <= 0) 583 sleepduration = intval; 584 585 /* 586 * Pull nexttbtt forward to reflect the current 587 * TSF and calculate dtim+cfp state for the result. 588 */ 589 tsf = ath9k_hw_gettsf64(sc->sc_ah); 590 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 591 592 num_beacons = tsftu / intval + 1; 593 offset = tsftu % intval; 594 nexttbtt = tsftu - offset; 595 if (offset) 596 nexttbtt += intval; 597 598 /* DTIM Beacon every dtimperiod Beacon */ 599 dtim_dec_count = num_beacons % dtimperiod; 600 /* CFP every cfpperiod DTIM Beacon */ 601 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 602 if (dtim_dec_count) 603 cfp_dec_count++; 604 605 dtimcount -= dtim_dec_count; 606 if (dtimcount < 0) 607 dtimcount += dtimperiod; 608 609 cfpcount -= cfp_dec_count; 610 if (cfpcount < 0) 611 cfpcount += cfpperiod; 612 613 bs.bs_intval = intval; 614 bs.bs_nexttbtt = nexttbtt; 615 bs.bs_dtimperiod = dtimperiod*intval; 616 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 617 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 618 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 619 bs.bs_cfpmaxduration = 0; 620 621 /* 622 * Calculate the number of consecutive beacons to miss* before taking 623 * a BMISS interrupt. The configuration is specified in TU so we only 624 * need calculate based on the beacon interval. Note that we clamp the 625 * result to at most 15 beacons. 626 */ 627 if (sleepduration > intval) { 628 bs.bs_bmissthreshold = conf->listen_interval * 629 ATH_DEFAULT_BMISS_LIMIT / 2; 630 } else { 631 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 632 if (bs.bs_bmissthreshold > 15) 633 bs.bs_bmissthreshold = 15; 634 else if (bs.bs_bmissthreshold <= 0) 635 bs.bs_bmissthreshold = 1; 636 } 637 638 /* 639 * Calculate sleep duration. The configuration is given in ms. 640 * We ensure a multiple of the beacon period is used. Also, if the sleep 641 * duration is greater than the DTIM period then it makes senses 642 * to make it a multiple of that. 643 * 644 * XXX fixed at 100ms 645 */ 646 647 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 648 if (bs.bs_sleepduration > bs.bs_dtimperiod) 649 bs.bs_sleepduration = bs.bs_dtimperiod; 650 651 /* TSF out of range threshold fixed at 1 second */ 652 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 653 654 DPRINTF(sc, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 655 DPRINTF(sc, ATH_DBG_BEACON, 656 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 657 bs.bs_bmissthreshold, bs.bs_sleepduration, 658 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 659 660 /* Set the computed STA beacon timers */ 661 662 ath9k_hw_set_interrupts(sc->sc_ah, 0); 663 ath9k_hw_set_sta_beacon_timers(sc->sc_ah, &bs); 664 sc->imask |= ATH9K_INT_BMISS; 665 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); 666 } 667 668 static void ath_beacon_config_adhoc(struct ath_softc *sc, 669 struct ath_beacon_config *conf, 670 struct ieee80211_vif *vif) 671 { 672 u64 tsf; 673 u32 tsftu, intval, nexttbtt; 674 675 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; 676 677 678 /* Pull nexttbtt forward to reflect the current TSF */ 679 680 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp); 681 if (nexttbtt == 0) 682 nexttbtt = intval; 683 else if (intval) 684 nexttbtt = roundup(nexttbtt, intval); 685 686 tsf = ath9k_hw_gettsf64(sc->sc_ah); 687 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE; 688 do { 689 nexttbtt += intval; 690 } while (nexttbtt < tsftu); 691 692 DPRINTF(sc, ATH_DBG_BEACON, 693 "IBSS nexttbtt %u intval %u (%u)\n", 694 nexttbtt, intval, conf->beacon_interval); 695 696 /* 697 * In IBSS mode enable the beacon timers but only enable SWBA interrupts 698 * if we need to manually prepare beacon frames. Otherwise we use a 699 * self-linked tx descriptor and let the hardware deal with things. 700 */ 701 intval |= ATH9K_BEACON_ENA; 702 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) 703 sc->imask |= ATH9K_INT_SWBA; 704 705 ath_beaconq_config(sc); 706 707 /* Set the computed ADHOC beacon timers */ 708 709 ath9k_hw_set_interrupts(sc->sc_ah, 0); 710 ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval); 711 sc->beacon.bmisscnt = 0; 712 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); 713 714 /* FIXME: Handle properly when vif is NULL */ 715 if (vif && sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL) 716 ath_beacon_start_adhoc(sc, vif); 717 } 718 719 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 720 { 721 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 722 enum nl80211_iftype iftype; 723 724 /* Setup the beacon configuration parameters */ 725 726 if (vif) { 727 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 728 729 iftype = vif->type; 730 731 cur_conf->beacon_interval = bss_conf->beacon_int; 732 cur_conf->dtim_period = bss_conf->dtim_period; 733 cur_conf->listen_interval = 1; 734 cur_conf->dtim_count = 1; 735 cur_conf->bmiss_timeout = 736 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 737 } else { 738 iftype = sc->sc_ah->opmode; 739 } 740 741 /* 742 * It looks like mac80211 may end up using beacon interval of zero in 743 * some cases (at least for mesh point). Avoid getting into an 744 * infinite loop by using a bit safer value instead. To be safe, 745 * do sanity check on beacon interval for all operating modes. 746 */ 747 if (cur_conf->beacon_interval == 0) 748 cur_conf->beacon_interval = 100; 749 750 switch (iftype) { 751 case NL80211_IFTYPE_AP: 752 ath_beacon_config_ap(sc, cur_conf); 753 break; 754 case NL80211_IFTYPE_ADHOC: 755 case NL80211_IFTYPE_MESH_POINT: 756 ath_beacon_config_adhoc(sc, cur_conf, vif); 757 break; 758 case NL80211_IFTYPE_STATION: 759 ath_beacon_config_sta(sc, cur_conf); 760 break; 761 default: 762 DPRINTF(sc, ATH_DBG_CONFIG, 763 "Unsupported beaconing mode\n"); 764 return; 765 } 766 767 sc->sc_flags |= SC_OP_BEACONS; 768 } 769