1 /* 2 * Copyright (c) 2008-2011 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include <linux/dma-mapping.h> 18 #include "ath9k.h" 19 20 #define FUDGE 2 21 22 static void ath9k_reset_beacon_status(struct ath_softc *sc) 23 { 24 sc->beacon.tx_processed = false; 25 sc->beacon.tx_last = false; 26 } 27 28 /* 29 * This function will modify certain transmit queue properties depending on 30 * the operating mode of the station (AP or AdHoc). Parameters are AIFS 31 * settings and channel width min/max 32 */ 33 static void ath9k_beaconq_config(struct ath_softc *sc) 34 { 35 struct ath_hw *ah = sc->sc_ah; 36 struct ath_common *common = ath9k_hw_common(ah); 37 struct ath9k_tx_queue_info qi, qi_be; 38 struct ath_txq *txq; 39 40 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); 41 42 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP || 43 sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) { 44 /* Always burst out beacon and CAB traffic. */ 45 qi.tqi_aifs = 1; 46 qi.tqi_cwmin = 0; 47 qi.tqi_cwmax = 0; 48 } else { 49 /* Adhoc mode; important thing is to use 2x cwmin. */ 50 txq = sc->tx.txq_map[IEEE80211_AC_BE]; 51 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); 52 qi.tqi_aifs = qi_be.tqi_aifs; 53 if (ah->slottime == ATH9K_SLOT_TIME_20) 54 qi.tqi_cwmin = 2*qi_be.tqi_cwmin; 55 else 56 qi.tqi_cwmin = 4*qi_be.tqi_cwmin; 57 qi.tqi_cwmax = qi_be.tqi_cwmax; 58 } 59 60 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { 61 ath_err(common, "Unable to update h/w beacon queue parameters\n"); 62 } else { 63 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); 64 } 65 } 66 67 /* 68 * Associates the beacon frame buffer with a transmit descriptor. Will set 69 * up rate codes, and channel flags. Beacons are always sent out at the 70 * lowest rate, and are not retried. 71 */ 72 static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif, 73 struct ath_buf *bf, int rateidx) 74 { 75 struct sk_buff *skb = bf->bf_mpdu; 76 struct ath_hw *ah = sc->sc_ah; 77 struct ath_common *common = ath9k_hw_common(ah); 78 struct ath_tx_info info; 79 struct ieee80211_supported_band *sband; 80 u8 chainmask = ah->txchainmask; 81 u8 rate = 0; 82 83 sband = &sc->sbands[common->hw->conf.chandef.chan->band]; 84 rate = sband->bitrates[rateidx].hw_value; 85 if (vif->bss_conf.use_short_preamble) 86 rate |= sband->bitrates[rateidx].hw_value_short; 87 88 memset(&info, 0, sizeof(info)); 89 info.pkt_len = skb->len + FCS_LEN; 90 info.type = ATH9K_PKT_TYPE_BEACON; 91 info.txpower = MAX_RATE_POWER; 92 info.keyix = ATH9K_TXKEYIX_INVALID; 93 info.keytype = ATH9K_KEY_TYPE_CLEAR; 94 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK; 95 96 info.buf_addr[0] = bf->bf_buf_addr; 97 info.buf_len[0] = roundup(skb->len, 4); 98 99 info.is_first = true; 100 info.is_last = true; 101 102 info.qcu = sc->beacon.beaconq; 103 104 info.rates[0].Tries = 1; 105 info.rates[0].Rate = rate; 106 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate); 107 108 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info); 109 } 110 111 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw, 112 struct ieee80211_vif *vif) 113 { 114 struct ath_softc *sc = hw->priv; 115 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 116 struct ath_buf *bf; 117 struct ath_vif *avp = (void *)vif->drv_priv; 118 struct sk_buff *skb; 119 struct ath_txq *cabq = sc->beacon.cabq; 120 struct ieee80211_tx_info *info; 121 struct ieee80211_mgmt *mgmt_hdr; 122 int cabq_depth; 123 124 if (avp->av_bcbuf == NULL) 125 return NULL; 126 127 bf = avp->av_bcbuf; 128 skb = bf->bf_mpdu; 129 if (skb) { 130 dma_unmap_single(sc->dev, bf->bf_buf_addr, 131 skb->len, DMA_TO_DEVICE); 132 dev_kfree_skb_any(skb); 133 bf->bf_buf_addr = 0; 134 bf->bf_mpdu = NULL; 135 } 136 137 skb = ieee80211_beacon_get(hw, vif); 138 if (skb == NULL) 139 return NULL; 140 141 bf->bf_mpdu = skb; 142 143 mgmt_hdr = (struct ieee80211_mgmt *)skb->data; 144 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust; 145 146 info = IEEE80211_SKB_CB(skb); 147 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { 148 /* 149 * TODO: make sure the seq# gets assigned properly (vs. other 150 * TX frames) 151 */ 152 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 153 sc->tx.seq_no += 0x10; 154 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); 155 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); 156 } 157 158 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 159 skb->len, DMA_TO_DEVICE); 160 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { 161 dev_kfree_skb_any(skb); 162 bf->bf_mpdu = NULL; 163 bf->bf_buf_addr = 0; 164 ath_err(common, "dma_mapping_error on beaconing\n"); 165 return NULL; 166 } 167 168 skb = ieee80211_get_buffered_bc(hw, vif); 169 170 /* 171 * if the CABQ traffic from previous DTIM is pending and the current 172 * beacon is also a DTIM. 173 * 1) if there is only one vif let the cab traffic continue. 174 * 2) if there are more than one vif and we are using staggered 175 * beacons, then drain the cabq by dropping all the frames in 176 * the cabq so that the current vifs cab traffic can be scheduled. 177 */ 178 spin_lock_bh(&cabq->axq_lock); 179 cabq_depth = cabq->axq_depth; 180 spin_unlock_bh(&cabq->axq_lock); 181 182 if (skb && cabq_depth) { 183 if (sc->nvifs > 1) { 184 ath_dbg(common, BEACON, 185 "Flushing previous cabq traffic\n"); 186 ath_draintxq(sc, cabq); 187 } 188 } 189 190 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); 191 192 if (skb) 193 ath_tx_cabq(hw, vif, skb); 194 195 return bf; 196 } 197 198 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 199 { 200 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 201 struct ath_vif *avp = (void *)vif->drv_priv; 202 int slot; 203 204 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); 205 list_del(&avp->av_bcbuf->list); 206 207 for (slot = 0; slot < ATH_BCBUF; slot++) { 208 if (sc->beacon.bslot[slot] == NULL) { 209 avp->av_bslot = slot; 210 break; 211 } 212 } 213 214 sc->beacon.bslot[avp->av_bslot] = vif; 215 sc->nbcnvifs++; 216 217 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", 218 avp->av_bslot); 219 } 220 221 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) 222 { 223 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 224 struct ath_vif *avp = (void *)vif->drv_priv; 225 struct ath_buf *bf = avp->av_bcbuf; 226 227 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", 228 avp->av_bslot); 229 230 tasklet_disable(&sc->bcon_tasklet); 231 232 if (bf && bf->bf_mpdu) { 233 struct sk_buff *skb = bf->bf_mpdu; 234 dma_unmap_single(sc->dev, bf->bf_buf_addr, 235 skb->len, DMA_TO_DEVICE); 236 dev_kfree_skb_any(skb); 237 bf->bf_mpdu = NULL; 238 bf->bf_buf_addr = 0; 239 } 240 241 avp->av_bcbuf = NULL; 242 sc->beacon.bslot[avp->av_bslot] = NULL; 243 sc->nbcnvifs--; 244 list_add_tail(&bf->list, &sc->beacon.bbuf); 245 246 tasklet_enable(&sc->bcon_tasklet); 247 } 248 249 static int ath9k_beacon_choose_slot(struct ath_softc *sc) 250 { 251 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 252 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 253 u16 intval; 254 u32 tsftu; 255 u64 tsf; 256 int slot; 257 258 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP && 259 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) { 260 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", 261 ath9k_hw_gettsf64(sc->sc_ah)); 262 return 0; 263 } 264 265 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; 266 tsf = ath9k_hw_gettsf64(sc->sc_ah); 267 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); 268 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); 269 slot = (tsftu % (intval * ATH_BCBUF)) / intval; 270 271 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", 272 slot, tsf, tsftu / ATH_BCBUF); 273 274 return slot; 275 } 276 277 static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) 278 { 279 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 280 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 281 struct ath_vif *avp = (void *)vif->drv_priv; 282 u32 tsfadjust; 283 284 if (avp->av_bslot == 0) 285 return; 286 287 tsfadjust = cur_conf->beacon_interval * avp->av_bslot; 288 tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF; 289 avp->tsf_adjust = cpu_to_le64(tsfadjust); 290 291 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", 292 (unsigned long long)tsfadjust, avp->av_bslot); 293 } 294 295 bool ath9k_csa_is_finished(struct ath_softc *sc) 296 { 297 struct ieee80211_vif *vif; 298 299 vif = sc->csa_vif; 300 if (!vif || !vif->csa_active) 301 return false; 302 303 if (!ieee80211_csa_is_complete(vif)) 304 return false; 305 306 ieee80211_csa_finish(vif); 307 308 sc->csa_vif = NULL; 309 return true; 310 } 311 312 void ath9k_beacon_tasklet(unsigned long data) 313 { 314 struct ath_softc *sc = (struct ath_softc *)data; 315 struct ath_hw *ah = sc->sc_ah; 316 struct ath_common *common = ath9k_hw_common(ah); 317 struct ath_buf *bf = NULL; 318 struct ieee80211_vif *vif; 319 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); 320 int slot; 321 322 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) { 323 ath_dbg(common, RESET, 324 "reset work is pending, skip beaconing now\n"); 325 return; 326 } 327 328 /* 329 * Check if the previous beacon has gone out. If 330 * not don't try to post another, skip this period 331 * and wait for the next. Missed beacons indicate 332 * a problem and should not occur. If we miss too 333 * many consecutive beacons reset the device. 334 */ 335 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { 336 sc->beacon.bmisscnt++; 337 338 ath9k_hw_check_nav(ah); 339 340 /* 341 * If the previous beacon has not been transmitted 342 * and a MAC/BB hang has been identified, return 343 * here because a chip reset would have been 344 * initiated. 345 */ 346 if (!ath_hw_check(sc)) 347 return; 348 349 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { 350 ath_dbg(common, BSTUCK, 351 "missed %u consecutive beacons\n", 352 sc->beacon.bmisscnt); 353 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); 354 if (sc->beacon.bmisscnt > 3) 355 ath9k_hw_bstuck_nfcal(ah); 356 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { 357 ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); 358 sc->beacon.bmisscnt = 0; 359 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); 360 } 361 362 return; 363 } 364 365 /* EDMA devices check that in the tx completion function. */ 366 if (!edma && ath9k_csa_is_finished(sc)) 367 return; 368 369 slot = ath9k_beacon_choose_slot(sc); 370 vif = sc->beacon.bslot[slot]; 371 372 if (!vif || !vif->bss_conf.enable_beacon) 373 return; 374 375 bf = ath9k_beacon_generate(sc->hw, vif); 376 377 if (sc->beacon.bmisscnt != 0) { 378 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", 379 sc->beacon.bmisscnt); 380 sc->beacon.bmisscnt = 0; 381 } 382 383 /* 384 * Handle slot time change when a non-ERP station joins/leaves 385 * an 11g network. The 802.11 layer notifies us via callback, 386 * we mark updateslot, then wait one beacon before effecting 387 * the change. This gives associated stations at least one 388 * beacon interval to note the state change. 389 * 390 * NB: The slot time change state machine is clocked according 391 * to whether we are bursting or staggering beacons. We 392 * recognize the request to update and record the current 393 * slot then don't transition until that slot is reached 394 * again. If we miss a beacon for that slot then we'll be 395 * slow to transition but we'll be sure at least one beacon 396 * interval has passed. When bursting slot is always left 397 * set to ATH_BCBUF so this check is a noop. 398 */ 399 if (sc->beacon.updateslot == UPDATE) { 400 sc->beacon.updateslot = COMMIT; 401 sc->beacon.slotupdate = slot; 402 } else if (sc->beacon.updateslot == COMMIT && 403 sc->beacon.slotupdate == slot) { 404 ah->slottime = sc->beacon.slottime; 405 ath9k_hw_init_global_settings(ah); 406 sc->beacon.updateslot = OK; 407 } 408 409 if (bf) { 410 ath9k_reset_beacon_status(sc); 411 412 ath_dbg(common, BEACON, 413 "Transmitting beacon for slot: %d\n", slot); 414 415 /* NB: cabq traffic should already be queued and primed */ 416 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); 417 418 if (!edma) 419 ath9k_hw_txstart(ah, sc->beacon.beaconq); 420 } 421 } 422 423 /* 424 * Both nexttbtt and intval have to be in usecs. 425 */ 426 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, 427 u32 intval, bool reset_tsf) 428 { 429 struct ath_hw *ah = sc->sc_ah; 430 431 ath9k_hw_disable_interrupts(ah); 432 if (reset_tsf) 433 ath9k_hw_reset_tsf(ah); 434 ath9k_beaconq_config(sc); 435 ath9k_hw_beaconinit(ah, nexttbtt, intval); 436 sc->beacon.bmisscnt = 0; 437 ath9k_hw_set_interrupts(ah); 438 ath9k_hw_enable_interrupts(ah); 439 } 440 441 /* Calculate the modulo of a 64 bit TSF snapshot with a TU divisor */ 442 static u32 ath9k_mod_tsf64_tu(u64 tsf, u32 div_tu) 443 { 444 u32 tsf_mod, tsf_hi, tsf_lo, mod_hi, mod_lo; 445 446 tsf_mod = tsf & (BIT(10) - 1); 447 tsf_hi = tsf >> 32; 448 tsf_lo = ((u32) tsf) >> 10; 449 450 mod_hi = tsf_hi % div_tu; 451 mod_lo = ((mod_hi << 22) + tsf_lo) % div_tu; 452 453 return (mod_lo << 10) | tsf_mod; 454 } 455 456 static u32 ath9k_get_next_tbtt(struct ath_softc *sc, u64 tsf, 457 unsigned int interval) 458 { 459 struct ath_hw *ah = sc->sc_ah; 460 unsigned int offset; 461 462 tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time); 463 offset = ath9k_mod_tsf64_tu(tsf, interval); 464 465 return (u32) tsf + TU_TO_USEC(interval) - offset; 466 } 467 468 /* 469 * For multi-bss ap support beacons are either staggered evenly over N slots or 470 * burst together. For the former arrange for the SWBA to be delivered for each 471 * slot. Slots that are not occupied will generate nothing. 472 */ 473 static void ath9k_beacon_config_ap(struct ath_softc *sc, 474 struct ath_beacon_config *conf) 475 { 476 struct ath_hw *ah = sc->sc_ah; 477 struct ath_common *common = ath9k_hw_common(ah); 478 u32 nexttbtt, intval; 479 480 /* NB: the beacon interval is kept internally in TU's */ 481 intval = TU_TO_USEC(conf->beacon_interval); 482 intval /= ATH_BCBUF; 483 nexttbtt = ath9k_get_next_tbtt(sc, ath9k_hw_gettsf64(ah), 484 conf->beacon_interval); 485 486 if (conf->enable_beacon) 487 ah->imask |= ATH9K_INT_SWBA; 488 else 489 ah->imask &= ~ATH9K_INT_SWBA; 490 491 ath_dbg(common, BEACON, 492 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 493 (conf->enable_beacon) ? "Enable" : "Disable", 494 nexttbtt, intval, conf->beacon_interval); 495 496 ath9k_beacon_init(sc, nexttbtt, intval, false); 497 } 498 499 /* 500 * This sets up the beacon timers according to the timestamp of the last 501 * received beacon and the current TSF, configures PCF and DTIM 502 * handling, programs the sleep registers so the hardware will wakeup in 503 * time to receive beacons, and configures the beacon miss handling so 504 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP 505 * we've associated with. 506 */ 507 static void ath9k_beacon_config_sta(struct ath_softc *sc, 508 struct ath_beacon_config *conf) 509 { 510 struct ath_hw *ah = sc->sc_ah; 511 struct ath_common *common = ath9k_hw_common(ah); 512 struct ath9k_beacon_state bs; 513 int dtim_intval, sleepduration; 514 u32 nexttbtt = 0, intval; 515 u64 tsf; 516 517 /* No need to configure beacon if we are not associated */ 518 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { 519 ath_dbg(common, BEACON, 520 "STA is not yet associated..skipping beacon config\n"); 521 return; 522 } 523 524 memset(&bs, 0, sizeof(bs)); 525 intval = conf->beacon_interval; 526 527 /* 528 * Setup dtim parameters according to 529 * last beacon we received (which may be none). 530 */ 531 dtim_intval = intval * conf->dtim_period; 532 sleepduration = conf->listen_interval * intval; 533 534 /* 535 * Pull nexttbtt forward to reflect the current 536 * TSF and calculate dtim state for the result. 537 */ 538 tsf = ath9k_hw_gettsf64(ah); 539 nexttbtt = ath9k_get_next_tbtt(sc, tsf, intval); 540 541 bs.bs_intval = TU_TO_USEC(intval); 542 bs.bs_dtimperiod = conf->dtim_period * bs.bs_intval; 543 bs.bs_nexttbtt = nexttbtt; 544 bs.bs_nextdtim = nexttbtt; 545 if (conf->dtim_period > 1) 546 bs.bs_nextdtim = ath9k_get_next_tbtt(sc, tsf, dtim_intval); 547 548 /* 549 * Calculate the number of consecutive beacons to miss* before taking 550 * a BMISS interrupt. The configuration is specified in TU so we only 551 * need calculate based on the beacon interval. Note that we clamp the 552 * result to at most 15 beacons. 553 */ 554 if (sleepduration > intval) { 555 bs.bs_bmissthreshold = conf->listen_interval * 556 ATH_DEFAULT_BMISS_LIMIT / 2; 557 } else { 558 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); 559 if (bs.bs_bmissthreshold > 15) 560 bs.bs_bmissthreshold = 15; 561 else if (bs.bs_bmissthreshold <= 0) 562 bs.bs_bmissthreshold = 1; 563 } 564 565 /* 566 * Calculate sleep duration. The configuration is given in ms. 567 * We ensure a multiple of the beacon period is used. Also, if the sleep 568 * duration is greater than the DTIM period then it makes senses 569 * to make it a multiple of that. 570 * 571 * XXX fixed at 100ms 572 */ 573 574 bs.bs_sleepduration = TU_TO_USEC(roundup(IEEE80211_MS_TO_TU(100), 575 sleepduration)); 576 if (bs.bs_sleepduration > bs.bs_dtimperiod) 577 bs.bs_sleepduration = bs.bs_dtimperiod; 578 579 /* TSF out of range threshold fixed at 1 second */ 580 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; 581 582 ath_dbg(common, BEACON, "bmiss: %u sleep: %u\n", 583 bs.bs_bmissthreshold, bs.bs_sleepduration); 584 585 /* Set the computed STA beacon timers */ 586 587 ath9k_hw_disable_interrupts(ah); 588 ath9k_hw_set_sta_beacon_timers(ah, &bs); 589 ah->imask |= ATH9K_INT_BMISS; 590 591 ath9k_hw_set_interrupts(ah); 592 ath9k_hw_enable_interrupts(ah); 593 } 594 595 static void ath9k_beacon_config_adhoc(struct ath_softc *sc, 596 struct ath_beacon_config *conf) 597 { 598 struct ath_hw *ah = sc->sc_ah; 599 struct ath_common *common = ath9k_hw_common(ah); 600 u32 intval, nexttbtt; 601 602 ath9k_reset_beacon_status(sc); 603 604 intval = TU_TO_USEC(conf->beacon_interval); 605 606 if (conf->ibss_creator) 607 nexttbtt = intval; 608 else 609 nexttbtt = ath9k_get_next_tbtt(sc, ath9k_hw_gettsf64(ah), 610 conf->beacon_interval); 611 612 if (conf->enable_beacon) 613 ah->imask |= ATH9K_INT_SWBA; 614 else 615 ah->imask &= ~ATH9K_INT_SWBA; 616 617 ath_dbg(common, BEACON, 618 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", 619 (conf->enable_beacon) ? "Enable" : "Disable", 620 nexttbtt, intval, conf->beacon_interval); 621 622 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); 623 624 /* 625 * Set the global 'beacon has been configured' flag for the 626 * joiner case in IBSS mode. 627 */ 628 if (!conf->ibss_creator && conf->enable_beacon) 629 set_bit(SC_OP_BEACONS, &sc->sc_flags); 630 } 631 632 static bool ath9k_allow_beacon_config(struct ath_softc *sc, 633 struct ieee80211_vif *vif) 634 { 635 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 636 struct ath_vif *avp = (void *)vif->drv_priv; 637 638 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { 639 if ((vif->type != NL80211_IFTYPE_AP) || 640 (sc->nbcnvifs > 1)) { 641 ath_dbg(common, CONFIG, 642 "An AP interface is already present !\n"); 643 return false; 644 } 645 } 646 647 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 648 if ((vif->type == NL80211_IFTYPE_STATION) && 649 test_bit(SC_OP_BEACONS, &sc->sc_flags) && 650 !avp->primary_sta_vif) { 651 ath_dbg(common, CONFIG, 652 "Beacon already configured for a station interface\n"); 653 return false; 654 } 655 } 656 657 return true; 658 } 659 660 static void ath9k_cache_beacon_config(struct ath_softc *sc, 661 struct ieee80211_bss_conf *bss_conf) 662 { 663 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 664 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 665 666 ath_dbg(common, BEACON, 667 "Caching beacon data for BSS: %pM\n", bss_conf->bssid); 668 669 cur_conf->beacon_interval = bss_conf->beacon_int; 670 cur_conf->dtim_period = bss_conf->dtim_period; 671 cur_conf->listen_interval = 1; 672 cur_conf->dtim_count = 1; 673 cur_conf->ibss_creator = bss_conf->ibss_creator; 674 cur_conf->bmiss_timeout = 675 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; 676 677 /* 678 * It looks like mac80211 may end up using beacon interval of zero in 679 * some cases (at least for mesh point). Avoid getting into an 680 * infinite loop by using a bit safer value instead. To be safe, 681 * do sanity check on beacon interval for all operating modes. 682 */ 683 if (cur_conf->beacon_interval == 0) 684 cur_conf->beacon_interval = 100; 685 686 /* 687 * We don't parse dtim period from mac80211 during the driver 688 * initialization as it breaks association with hidden-ssid 689 * AP and it causes latency in roaming 690 */ 691 if (cur_conf->dtim_period == 0) 692 cur_conf->dtim_period = 1; 693 694 } 695 696 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, 697 u32 changed) 698 { 699 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; 700 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 701 unsigned long flags; 702 bool skip_beacon = false; 703 704 if (vif->type == NL80211_IFTYPE_AP) 705 ath9k_set_tsfadjust(sc, vif); 706 707 if (!ath9k_allow_beacon_config(sc, vif)) 708 return; 709 710 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { 711 ath9k_cache_beacon_config(sc, bss_conf); 712 ath9k_set_beacon(sc); 713 set_bit(SC_OP_BEACONS, &sc->sc_flags); 714 return; 715 } 716 717 /* 718 * Take care of multiple interfaces when 719 * enabling/disabling SWBA. 720 */ 721 if (changed & BSS_CHANGED_BEACON_ENABLED) { 722 if (!bss_conf->enable_beacon && 723 (sc->nbcnvifs <= 1)) { 724 cur_conf->enable_beacon = false; 725 } else if (bss_conf->enable_beacon) { 726 cur_conf->enable_beacon = true; 727 ath9k_cache_beacon_config(sc, bss_conf); 728 } 729 } 730 731 /* 732 * Configure the HW beacon registers only when we have a valid 733 * beacon interval. 734 */ 735 if (cur_conf->beacon_interval) { 736 /* 737 * If we are joining an existing IBSS network, start beaconing 738 * only after a TSF-sync has taken place. Ensure that this 739 * happens by setting the appropriate flags. 740 */ 741 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && 742 bss_conf->enable_beacon) { 743 spin_lock_irqsave(&sc->sc_pm_lock, flags); 744 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; 745 spin_unlock_irqrestore(&sc->sc_pm_lock, flags); 746 skip_beacon = true; 747 } else { 748 ath9k_set_beacon(sc); 749 } 750 751 /* 752 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode 753 * here, it is done in ath9k_beacon_config_adhoc(). 754 */ 755 if (cur_conf->enable_beacon && !skip_beacon) 756 set_bit(SC_OP_BEACONS, &sc->sc_flags); 757 else 758 clear_bit(SC_OP_BEACONS, &sc->sc_flags); 759 } 760 } 761 762 void ath9k_set_beacon(struct ath_softc *sc) 763 { 764 struct ath_common *common = ath9k_hw_common(sc->sc_ah); 765 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; 766 767 switch (sc->sc_ah->opmode) { 768 case NL80211_IFTYPE_AP: 769 case NL80211_IFTYPE_MESH_POINT: 770 ath9k_beacon_config_ap(sc, cur_conf); 771 break; 772 case NL80211_IFTYPE_ADHOC: 773 ath9k_beacon_config_adhoc(sc, cur_conf); 774 break; 775 case NL80211_IFTYPE_STATION: 776 ath9k_beacon_config_sta(sc, cur_conf); 777 break; 778 default: 779 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); 780 return; 781 } 782 } 783