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, false); 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 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, u32 intval) 411 { 412 struct ath_hw *ah = sc->sc_ah; 413 414 ath9k_hw_disable_interrupts(ah); 415 ath9k_hw_reset_tsf(ah); 416 ath9k_beaconq_config(sc); 417 ath9k_hw_beaconinit(ah, nexttbtt, intval); 418 sc->beacon.bmisscnt = 0; 419 ath9k_hw_set_interrupts(ah); 420 ath9k_hw_enable_interrupts(ah); 421 } 422 423 /* 424 * For multi-bss ap support beacons are either staggered evenly over N slots or 425 * burst together. For the former arrange for the SWBA to be delivered for each 426 * slot. Slots that are not occupied will generate nothing. 427 */ 428 static void ath9k_beacon_config_ap(struct ath_softc *sc, 429 struct ath_beacon_config *conf) 430 { 431 struct ath_hw *ah = sc->sc_ah; 432 struct ath_common *common = ath9k_hw_common(ah); 433 u32 nexttbtt, intval; 434 435 /* NB: the beacon interval is kept internally in TU's */ 436 intval = TU_TO_USEC(conf->beacon_interval); 437 intval /= ATH_BCBUF; 438 nexttbtt = intval; 439 440 if (conf->enable_beacon) 441 ah->imask |= ATH9K_INT_SWBA; 442 else 443 ah->imask &= ~ATH9K_INT_SWBA; 444 445 ath_dbg(common, BEACON, "AP nexttbtt: %u intval: %u conf_intval: %u\n", 446 nexttbtt, intval, conf->beacon_interval); 447 448 ath9k_beacon_init(sc, nexttbtt, intval); 449 } 450 451 /* 452 * This sets up the beacon timers according to the timestamp of the last 453 * received beacon and the current TSF, configures PCF and DTIM 454 * handling, programs the sleep registers so the hardware will wakeup in 455 * time to receive beacons, and configures the beacon miss handling so 456 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 457 * we've associated with. 458 */ 459 static void ath9k_beacon_config_sta(struct ath_softc *sc, 460 struct ath_beacon_config *conf) 461 { 462 struct ath_hw *ah = sc->sc_ah; 463 struct ath_common *common = ath9k_hw_common(ah); 464 struct ath9k_beacon_state bs; 465 int dtimperiod, dtimcount, sleepduration; 466 int cfpperiod, cfpcount; 467 u32 nexttbtt = 0, intval, tsftu; 468 u64 tsf; 469 int num_beacons, offset, dtim_dec_count, cfp_dec_count; 470 471 /* No need to configure beacon if we are not associated */ 472 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { 473 ath_dbg(common, BEACON, 474 "STA is not yet associated..skipping beacon config\n"); 475 return; 476 } 477 478 memset(&bs, 0, sizeof(bs)); 479 intval = conf->beacon_interval; 480 481 /* 482 * Setup dtim and cfp parameters according to 483 * last beacon we received (which may be none). 484 */ 485 dtimperiod = conf->dtim_period; 486 dtimcount = conf->dtim_count; 487 if (dtimcount >= dtimperiod) /* NB: sanity check */ 488 dtimcount = 0; 489 cfpperiod = 1; /* NB: no PCF support yet */ 490 cfpcount = 0; 491 492 sleepduration = conf->listen_interval * intval; 493 494 /* 495 * Pull nexttbtt forward to reflect the current 496 * TSF and calculate dtim+cfp state for the result. 497 */ 498 tsf = ath9k_hw_gettsf64(ah); 499 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; 500 501 num_beacons = tsftu / intval + 1; 502 offset = tsftu % intval; 503 nexttbtt = tsftu - offset; 504 if (offset) 505 nexttbtt += intval; 506 507 /* DTIM Beacon every dtimperiod Beacon */ 508 dtim_dec_count = num_beacons % dtimperiod; 509 /* CFP every cfpperiod DTIM Beacon */ 510 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; 511 if (dtim_dec_count) 512 cfp_dec_count++; 513 514 dtimcount -= dtim_dec_count; 515 if (dtimcount < 0) 516 dtimcount += dtimperiod; 517 518 cfpcount -= cfp_dec_count; 519 if (cfpcount < 0) 520 cfpcount += cfpperiod; 521 522 bs.bs_intval = intval; 523 bs.bs_nexttbtt = nexttbtt; 524 bs.bs_dtimperiod = dtimperiod*intval; 525 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; 526 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; 527 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; 528 bs.bs_cfpmaxduration = 0; 529 530 /* 531 * Calculate the number of consecutive beacons to miss* before taking 532 * a BMISS interrupt. The configuration is specified in TU so we only 533 * need calculate based on the beacon interval. Note that we clamp the 534 * result to at most 15 beacons. 535 */ 536 if (sleepduration > intval) { 537 bs.bs_bmissthreshold = conf->listen_interval * 538 ATH_DEFAULT_BMISS_LIMIT / 2; 539 } else { 540 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 541 if (bs.bs_bmissthreshold > 15) 542 bs.bs_bmissthreshold = 15; 543 else if (bs.bs_bmissthreshold <= 0) 544 bs.bs_bmissthreshold = 1; 545 } 546 547 /* 548 * Calculate sleep duration. The configuration is given in ms. 549 * We ensure a multiple of the beacon period is used. Also, if the sleep 550 * duration is greater than the DTIM period then it makes senses 551 * to make it a multiple of that. 552 * 553 * XXX fixed at 100ms 554 */ 555 556 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); 557 if (bs.bs_sleepduration > bs.bs_dtimperiod) 558 bs.bs_sleepduration = bs.bs_dtimperiod; 559 560 /* TSF out of range threshold fixed at 1 second */ 561 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 562 563 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); 564 ath_dbg(common, BEACON, 565 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", 566 bs.bs_bmissthreshold, bs.bs_sleepduration, 567 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); 568 569 /* Set the computed STA beacon timers */ 570 571 ath9k_hw_disable_interrupts(ah); 572 ath9k_hw_set_sta_beacon_timers(ah, &bs); 573 ah->imask |= ATH9K_INT_BMISS; 574 575 ath9k_hw_set_interrupts(ah); 576 ath9k_hw_enable_interrupts(ah); 577 } 578 579 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 580 struct ath_beacon_config *conf) 581 { 582 struct ath_hw *ah = sc->sc_ah; 583 struct ath_common *common = ath9k_hw_common(ah); 584 u32 intval, nexttbtt; 585 586 ath9k_reset_beacon_status(sc); 587 588 intval = TU_TO_USEC(conf->beacon_interval); 589 nexttbtt = intval; 590 591 if (conf->enable_beacon) 592 ah->imask |= ATH9K_INT_SWBA; 593 else 594 ah->imask &= ~ATH9K_INT_SWBA; 595 596 ath_dbg(common, BEACON, "IBSS nexttbtt: %u intval: %u conf_intval: %u\n", 597 nexttbtt, intval, conf->beacon_interval); 598 599 ath9k_beacon_init(sc, nexttbtt, intval); 600 } 601 602 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) 603 { 604 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 605 struct ath_vif *avp = (void *)vif->drv_priv; 606 607 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 608 if ((vif->type != NL80211_IFTYPE_AP) || 609 (sc->nbcnvifs > 1)) { 610 ath_dbg(common, CONFIG, 611 "An AP interface is already present !\n"); 612 return false; 613 } 614 } 615 616 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 617 if ((vif->type == NL80211_IFTYPE_STATION) && 618 test_bit(SC_OP_BEACONS, &sc->sc_flags) && 619 !avp->primary_sta_vif) { 620 ath_dbg(common, CONFIG, 621 "Beacon already configured for a station interface\n"); 622 return false; 623 } 624 } 625 626 return true; 627 } 628 629 static void ath9k_cache_beacon_config(struct ath_softc *sc, 630 struct ieee80211_bss_conf *bss_conf) 631 { 632 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 633 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 634 635 ath_dbg(common, BEACON, 636 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 637 638 cur_conf->beacon_interval = bss_conf->beacon_int; 639 cur_conf->dtim_period = bss_conf->dtim_period; 640 cur_conf->listen_interval = 1; 641 cur_conf->dtim_count = 1; 642 cur_conf->bmiss_timeout = 643 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 644 645 /* 646 * It looks like mac80211 may end up using beacon interval of zero in 647 * some cases (at least for mesh point). Avoid getting into an 648 * infinite loop by using a bit safer value instead. To be safe, 649 * do sanity check on beacon interval for all operating modes. 650 */ 651 if (cur_conf->beacon_interval == 0) 652 cur_conf->beacon_interval = 100; 653 654 /* 655 * We don't parse dtim period from mac80211 during the driver 656 * initialization as it breaks association with hidden-ssid 657 * AP and it causes latency in roaming 658 */ 659 if (cur_conf->dtim_period == 0) 660 cur_conf->dtim_period = 1; 661 662 } 663 664 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 665 u32 changed) 666 { 667 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 668 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 669 670 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 671 ath9k_cache_beacon_config(sc, bss_conf); 672 ath9k_set_beacon(sc); 673 set_bit(SC_OP_BEACONS, &sc->sc_flags); 674 } else { 675 /* 676 * Take care of multiple interfaces when 677 * enabling/disabling SWBA. 678 */ 679 if (changed & BSS_CHANGED_BEACON_ENABLED) { 680 if (!bss_conf->enable_beacon && 681 (sc->nbcnvifs <= 1)) { 682 cur_conf->enable_beacon = false; 683 } else if (bss_conf->enable_beacon) { 684 cur_conf->enable_beacon = true; 685 ath9k_cache_beacon_config(sc, bss_conf); 686 } 687 } 688 689 if (cur_conf->beacon_interval) { 690 ath9k_set_beacon(sc); 691 692 if (cur_conf->enable_beacon) 693 set_bit(SC_OP_BEACONS, &sc->sc_flags); 694 else 695 clear_bit(SC_OP_BEACONS, &sc->sc_flags); 696 } 697 } 698 } 699 700 void ath9k_set_beacon(struct ath_softc *sc) 701 { 702 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 703 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 704 705 switch (sc->sc_ah->opmode) { 706 case NL80211_IFTYPE_AP: 707 ath9k_beacon_config_ap(sc, cur_conf); 708 break; 709 case NL80211_IFTYPE_ADHOC: 710 case NL80211_IFTYPE_MESH_POINT: 711 ath9k_beacon_config_adhoc(sc, cur_conf); 712 break; 713 case NL80211_IFTYPE_STATION: 714 ath9k_beacon_config_sta(sc, cur_conf); 715 break; 716 default: 717 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 718 return; 719 } 720 } 721