diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/beacon.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/beacon.c | 767 |
1 files changed, 767 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c new file mode 100644 index 00000000000..3639a2e6987 --- /dev/null +++ b/drivers/net/wireless/ath/ath9k/beacon.c @@ -0,0 +1,767 @@ +/* + * Copyright (c) 2008-2009 Atheros Communications Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "ath9k.h" + +#define FUDGE 2 + +/* + * This function will modify certain transmit queue properties depending on + * the operating mode of the station (AP or AdHoc). Parameters are AIFS + * settings and channel width min/max +*/ +static int ath_beaconq_config(struct ath_softc *sc) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath9k_tx_queue_info qi; + + ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi); + if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { + /* Always burst out beacon and CAB traffic. */ + qi.tqi_aifs = 1; + qi.tqi_cwmin = 0; + qi.tqi_cwmax = 0; + } else { + /* Adhoc mode; important thing is to use 2x cwmin. */ + qi.tqi_aifs = sc->beacon.beacon_qi.tqi_aifs; + qi.tqi_cwmin = 2*sc->beacon.beacon_qi.tqi_cwmin; + qi.tqi_cwmax = sc->beacon.beacon_qi.tqi_cwmax; + } + + if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { + DPRINTF(sc, ATH_DBG_FATAL, + "Unable to update h/w beacon queue parameters\n"); + return 0; + } else { + ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); + return 1; + } +} + +/* + * Associates the beacon frame buffer with a transmit descriptor. Will set + * up all required antenna switch parameters, rate codes, and channel flags. + * Beacons are always sent out at the lowest rate, and are not retried. +*/ +static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp, + struct ath_buf *bf) +{ + struct sk_buff *skb = bf->bf_mpdu; + struct ath_hw *ah = sc->sc_ah; + struct ath_desc *ds; + struct ath9k_11n_rate_series series[4]; + const struct ath_rate_table *rt; + int flags, antenna, ctsrate = 0, ctsduration = 0; + u8 rate; + + ds = bf->bf_desc; + flags = ATH9K_TXDESC_NOACK; + + if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) || + (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) && + (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { + ds->ds_link = bf->bf_daddr; /* self-linked */ + flags |= ATH9K_TXDESC_VEOL; + /* Let hardware handle antenna switching. */ + antenna = 0; + } else { + ds->ds_link = 0; + /* + * Switch antenna every beacon. + * Should only switch every beacon period, not for every SWBA + * XXX assumes two antennae + */ + antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1); + } + + ds->ds_data = bf->bf_buf_addr; + + rt = sc->cur_rate_table; + rate = rt->info[0].ratecode; + if (sc->sc_flags & SC_OP_PREAMBLE_SHORT) + rate |= rt->info[0].short_preamble; + + ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN, + ATH9K_PKT_TYPE_BEACON, + MAX_RATE_POWER, + ATH9K_TXKEYIX_INVALID, + ATH9K_KEY_TYPE_CLEAR, + flags); + + /* NB: beacon's BufLen must be a multiple of 4 bytes */ + ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4), + true, true, ds); + + memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4); + series[0].Tries = 1; + series[0].Rate = rate; + series[0].ChSel = sc->tx_chainmask; + series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0; + ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration, + series, 4, 0); +} + +static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw, + struct ieee80211_vif *vif) +{ + struct ath_wiphy *aphy = hw->priv; + struct ath_softc *sc = aphy->sc; + struct ath_buf *bf; + struct ath_vif *avp; + struct sk_buff *skb; + struct ath_txq *cabq; + struct ieee80211_tx_info *info; + int cabq_depth; + + if (aphy->state != ATH_WIPHY_ACTIVE) + return NULL; + + avp = (void *)vif->drv_priv; + cabq = sc->beacon.cabq; + + if (avp->av_bcbuf == NULL) + return NULL; + + /* Release the old beacon first */ + + bf = avp->av_bcbuf; + skb = bf->bf_mpdu; + if (skb) { + dma_unmap_single(sc->dev, bf->bf_dmacontext, + skb->len, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); + } + + /* Get a new beacon from mac80211 */ + + skb = ieee80211_beacon_get(hw, vif); + bf->bf_mpdu = skb; + if (skb == NULL) + return NULL; + ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = + avp->tsf_adjust; + + info = IEEE80211_SKB_CB(skb); + if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) { + /* + * TODO: make sure the seq# gets assigned properly (vs. other + * TX frames) + */ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + sc->tx.seq_no += 0x10; + hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); + hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no); + } + + bf->bf_buf_addr = bf->bf_dmacontext = + dma_map_single(sc->dev, skb->data, + skb->len, DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { + dev_kfree_skb_any(skb); + bf->bf_mpdu = NULL; + DPRINTF(sc, ATH_DBG_FATAL, "dma_mapping_error on beaconing\n"); + return NULL; + } + + skb = ieee80211_get_buffered_bc(hw, vif); + + /* + * if the CABQ traffic from previous DTIM is pending and the current + * beacon is also a DTIM. + * 1) if there is only one vif let the cab traffic continue. + * 2) if there are more than one vif and we are using staggered + * beacons, then drain the cabq by dropping all the frames in + * the cabq so that the current vifs cab traffic can be scheduled. + */ + spin_lock_bh(&cabq->axq_lock); + cabq_depth = cabq->axq_depth; + spin_unlock_bh(&cabq->axq_lock); + + if (skb && cabq_depth) { + if (sc->nvifs > 1) { + DPRINTF(sc, ATH_DBG_BEACON, + "Flushing previous cabq traffic\n"); + ath_draintxq(sc, cabq, false); + } + } + + ath_beacon_setup(sc, avp, bf); + + while (skb) { + ath_tx_cabq(hw, skb); + skb = ieee80211_get_buffered_bc(hw, vif); + } + + return bf; +} + +/* + * Startup beacon transmission for adhoc mode when they are sent entirely + * by the hardware using the self-linked descriptor + veol trick. +*/ +static void ath_beacon_start_adhoc(struct ath_softc *sc, + struct ieee80211_vif *vif) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_buf *bf; + struct ath_vif *avp; + struct sk_buff *skb; + + avp = (void *)vif->drv_priv; + + if (avp->av_bcbuf == NULL) + return; + + bf = avp->av_bcbuf; + skb = bf->bf_mpdu; + + ath_beacon_setup(sc, avp, bf); + + /* NB: caller is known to have already stopped tx dma */ + ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); + ath9k_hw_txstart(ah, sc->beacon.beaconq); + DPRINTF(sc, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n", + sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc); +} + +int ath_beaconq_setup(struct ath_hw *ah) +{ + struct ath9k_tx_queue_info qi; + + memset(&qi, 0, sizeof(qi)); + qi.tqi_aifs = 1; + qi.tqi_cwmin = 0; + qi.tqi_cwmax = 0; + /* NB: don't enable any interrupts */ + return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi); +} + +int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif) +{ + struct ath_softc *sc = aphy->sc; + struct ath_vif *avp; + struct ath_buf *bf; + struct sk_buff *skb; + __le64 tstamp; + + avp = (void *)vif->drv_priv; + + /* Allocate a beacon descriptor if we haven't done so. */ + if (!avp->av_bcbuf) { + /* Allocate beacon state for hostap/ibss. We know + * a buffer is available. */ + avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, + struct ath_buf, list); + list_del(&avp->av_bcbuf->list); + + if (sc->sc_ah->opmode == NL80211_IFTYPE_AP || + !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) { + int slot; + /* + * Assign the vif to a beacon xmit slot. As + * above, this cannot fail to find one. + */ + avp->av_bslot = 0; + for (slot = 0; slot < ATH_BCBUF; slot++) + if (sc->beacon.bslot[slot] == NULL) { + /* + * XXX hack, space out slots to better + * deal with misses + */ + if (slot+1 < ATH_BCBUF && + sc->beacon.bslot[slot+1] == NULL) { + avp->av_bslot = slot+1; + break; + } + avp->av_bslot = slot; + /* NB: keep looking for a double slot */ + } + BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL); + sc->beacon.bslot[avp->av_bslot] = vif; + sc->beacon.bslot_aphy[avp->av_bslot] = aphy; + sc->nbcnvifs++; + } + } + + /* release the previous beacon frame, if it already exists. */ + bf = avp->av_bcbuf; + if (bf->bf_mpdu != NULL) { + skb = bf->bf_mpdu; + dma_unmap_single(sc->dev, bf->bf_dmacontext, + skb->len, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); + bf->bf_mpdu = NULL; + } + + /* NB: the beacon data buffer must be 32-bit aligned. */ + skb = ieee80211_beacon_get(sc->hw, vif); + if (skb == NULL) { + DPRINTF(sc, ATH_DBG_BEACON, "cannot get skb\n"); + return -ENOMEM; + } + + tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp; + sc->beacon.bc_tstamp = le64_to_cpu(tstamp); + /* Calculate a TSF adjustment factor required for staggered beacons. */ + if (avp->av_bslot > 0) { + u64 tsfadjust; + int intval; + + intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; + + /* + * Calculate the TSF offset for this beacon slot, i.e., the + * number of usecs that need to be added to the timestamp field + * in Beacon and Probe Response frames. Beacon slot 0 is + * processed at the correct offset, so it does not require TSF + * adjustment. Other slots are adjusted to get the timestamp + * close to the TBTT for the BSS. + */ + tsfadjust = intval * avp->av_bslot / ATH_BCBUF; + avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); + + DPRINTF(sc, ATH_DBG_BEACON, + "stagger beacons, bslot %d intval %u tsfadjust %llu\n", + avp->av_bslot, intval, (unsigned long long)tsfadjust); + + ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp = + avp->tsf_adjust; + } else + avp->tsf_adjust = cpu_to_le64(0); + + bf->bf_mpdu = skb; + bf->bf_buf_addr = bf->bf_dmacontext = + dma_map_single(sc->dev, skb->data, + skb->len, DMA_TO_DEVICE); + if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) { + dev_kfree_skb_any(skb); + bf->bf_mpdu = NULL; + DPRINTF(sc, ATH_DBG_FATAL, + "dma_mapping_error on beacon alloc\n"); + return -ENOMEM; + } + + return 0; +} + +void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp) +{ + if (avp->av_bcbuf != NULL) { + struct ath_buf *bf; + + if (avp->av_bslot != -1) { + sc->beacon.bslot[avp->av_bslot] = NULL; + sc->beacon.bslot_aphy[avp->av_bslot] = NULL; + sc->nbcnvifs--; + } + + bf = avp->av_bcbuf; + if (bf->bf_mpdu != NULL) { + struct sk_buff *skb = bf->bf_mpdu; + dma_unmap_single(sc->dev, bf->bf_dmacontext, + skb->len, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); + bf->bf_mpdu = NULL; + } + list_add_tail(&bf->list, &sc->beacon.bbuf); + + avp->av_bcbuf = NULL; + } +} + +void ath_beacon_tasklet(unsigned long data) +{ + struct ath_softc *sc = (struct ath_softc *)data; + struct ath_hw *ah = sc->sc_ah; + struct ath_buf *bf = NULL; + struct ieee80211_vif *vif; + struct ath_wiphy *aphy; + int slot; + u32 bfaddr, bc = 0, tsftu; + u64 tsf; + u16 intval; + + /* + * Check if the previous beacon has gone out. If + * not don't try to post another, skip this period + * and wait for the next. Missed beacons indicate + * a problem and should not occur. If we miss too + * many consecutive beacons reset the device. + */ + if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) { + sc->beacon.bmisscnt++; + + if (sc->beacon.bmisscnt < BSTUCK_THRESH) { + DPRINTF(sc, ATH_DBG_BEACON, + "missed %u consecutive beacons\n", + sc->beacon.bmisscnt); + } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { + DPRINTF(sc, ATH_DBG_BEACON, + "beacon is officially stuck\n"); + sc->sc_flags |= SC_OP_TSF_RESET; + ath_reset(sc, false); + } + + return; + } + + if (sc->beacon.bmisscnt != 0) { + DPRINTF(sc, ATH_DBG_BEACON, + "resume beacon xmit after %u misses\n", + sc->beacon.bmisscnt); + sc->beacon.bmisscnt = 0; + } + + /* + * Generate beacon frames. we are sending frames + * staggered so calculate the slot for this frame based + * on the tsf to safeguard against missing an swba. + */ + + intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL; + + tsf = ath9k_hw_gettsf64(ah); + tsftu = TSF_TO_TU(tsf>>32, tsf); + slot = ((tsftu % intval) * ATH_BCBUF) / intval; + /* + * Reverse the slot order to get slot 0 on the TBTT offset that does + * not require TSF adjustment and other slots adding + * slot/ATH_BCBUF * beacon_int to timestamp. For example, with + * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 .. + * and slot 0 is at correct offset to TBTT. + */ + slot = ATH_BCBUF - slot - 1; + vif = sc->beacon.bslot[slot]; + aphy = sc->beacon.bslot_aphy[slot]; + + DPRINTF(sc, ATH_DBG_BEACON, + "slot %d [tsf %llu tsftu %u intval %u] vif %p\n", + slot, tsf, tsftu, intval, vif); + + bfaddr = 0; + if (vif) { + bf = ath_beacon_generate(aphy->hw, vif); + if (bf != NULL) { + bfaddr = bf->bf_daddr; + bc = 1; + } + } + + /* + * Handle slot time change when a non-ERP station joins/leaves + * an 11g network. The 802.11 layer notifies us via callback, + * we mark updateslot, then wait one beacon before effecting + * the change. This gives associated stations at least one + * beacon interval to note the state change. + * + * NB: The slot time change state machine is clocked according + * to whether we are bursting or staggering beacons. We + * recognize the request to update and record the current + * slot then don't transition until that slot is reached + * again. If we miss a beacon for that slot then we'll be + * slow to transition but we'll be sure at least one beacon + * interval has passed. When bursting slot is always left + * set to ATH_BCBUF so this check is a noop. + */ + if (sc->beacon.updateslot == UPDATE) { + sc->beacon.updateslot = COMMIT; /* commit next beacon */ + sc->beacon.slotupdate = slot; + } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) { + ath9k_hw_setslottime(sc->sc_ah, sc->beacon.slottime); + sc->beacon.updateslot = OK; + } + if (bfaddr != 0) { + /* + * Stop any current dma and put the new frame(s) on the queue. + * This should never fail since we check above that no frames + * are still pending on the queue. + */ + if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) { + DPRINTF(sc, ATH_DBG_FATAL, + "beacon queue %u did not stop?\n", sc->beacon.beaconq); + } + + /* NB: cabq traffic should already be queued and primed */ + ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr); + ath9k_hw_txstart(ah, sc->beacon.beaconq); + + sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ + } +} + +/* + * For multi-bss ap support beacons are either staggered evenly over N slots or + * burst together. For the former arrange for the SWBA to be delivered for each + * slot. Slots that are not occupied will generate nothing. + */ +static void ath_beacon_config_ap(struct ath_softc *sc, + struct ath_beacon_config *conf) +{ + u32 nexttbtt, intval; + + /* Configure the timers only when the TSF has to be reset */ + + if (!(sc->sc_flags & SC_OP_TSF_RESET)) + return; + + /* NB: the beacon interval is kept internally in TU's */ + intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; + intval /= ATH_BCBUF; /* for staggered beacons */ + nexttbtt = intval; + intval |= ATH9K_BEACON_RESET_TSF; + + /* + * In AP mode we enable the beacon timers and SWBA interrupts to + * prepare beacon frames. + */ + intval |= ATH9K_BEACON_ENA; + sc->imask |= ATH9K_INT_SWBA; + ath_beaconq_config(sc); + + /* Set the computed AP beacon timers */ + + ath9k_hw_set_interrupts(sc->sc_ah, 0); + ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval); + sc->beacon.bmisscnt = 0; + ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); + + /* Clear the reset TSF flag, so that subsequent beacon updation + will not reset the HW TSF. */ + + sc->sc_flags &= ~SC_OP_TSF_RESET; +} + +/* + * This sets up the beacon timers according to the timestamp of the last + * received beacon and the current TSF, configures PCF and DTIM + * handling, programs the sleep registers so the hardware will wakeup in + * time to receive beacons, and configures the beacon miss handling so + * we'll receive a BMISS interrupt when we stop seeing beacons from the AP + * we've associated with. + */ +static void ath_beacon_config_sta(struct ath_softc *sc, + struct ath_beacon_config *conf) +{ + struct ath9k_beacon_state bs; + int dtimperiod, dtimcount, sleepduration; + int cfpperiod, cfpcount; + u32 nexttbtt = 0, intval, tsftu; + u64 tsf; + int num_beacons, offset, dtim_dec_count, cfp_dec_count; + + memset(&bs, 0, sizeof(bs)); + intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; + + /* + * Setup dtim and cfp parameters according to + * last beacon we received (which may be none). + */ + dtimperiod = conf->dtim_period; + if (dtimperiod <= 0) /* NB: 0 if not known */ + dtimperiod = 1; + dtimcount = conf->dtim_count; + if (dtimcount >= dtimperiod) /* NB: sanity check */ + dtimcount = 0; + cfpperiod = 1; /* NB: no PCF support yet */ + cfpcount = 0; + + sleepduration = conf->listen_interval * intval; + if (sleepduration <= 0) + sleepduration = intval; + + /* + * Pull nexttbtt forward to reflect the current + * TSF and calculate dtim+cfp state for the result. + */ + tsf = ath9k_hw_gettsf64(sc->sc_ah); + tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE; + + num_beacons = tsftu / intval + 1; + offset = tsftu % intval; + nexttbtt = tsftu - offset; + if (offset) + nexttbtt += intval; + + /* DTIM Beacon every dtimperiod Beacon */ + dtim_dec_count = num_beacons % dtimperiod; + /* CFP every cfpperiod DTIM Beacon */ + cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod; + if (dtim_dec_count) + cfp_dec_count++; + + dtimcount -= dtim_dec_count; + if (dtimcount < 0) + dtimcount += dtimperiod; + + cfpcount -= cfp_dec_count; + if (cfpcount < 0) + cfpcount += cfpperiod; + + bs.bs_intval = intval; + bs.bs_nexttbtt = nexttbtt; + bs.bs_dtimperiod = dtimperiod*intval; + bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval; + bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod; + bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod; + bs.bs_cfpmaxduration = 0; + + /* + * Calculate the number of consecutive beacons to miss* before taking + * a BMISS interrupt. The configuration is specified in TU so we only + * need calculate based on the beacon interval. Note that we clamp the + * result to at most 15 beacons. + */ + if (sleepduration > intval) { + bs.bs_bmissthreshold = conf->listen_interval * + ATH_DEFAULT_BMISS_LIMIT / 2; + } else { + bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval); + if (bs.bs_bmissthreshold > 15) + bs.bs_bmissthreshold = 15; + else if (bs.bs_bmissthreshold <= 0) + bs.bs_bmissthreshold = 1; + } + + /* + * Calculate sleep duration. The configuration is given in ms. + * We ensure a multiple of the beacon period is used. Also, if the sleep + * duration is greater than the DTIM period then it makes senses + * to make it a multiple of that. + * + * XXX fixed at 100ms + */ + + bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration); + if (bs.bs_sleepduration > bs.bs_dtimperiod) + bs.bs_sleepduration = bs.bs_dtimperiod; + + /* TSF out of range threshold fixed at 1 second */ + bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD; + + DPRINTF(sc, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); + DPRINTF(sc, ATH_DBG_BEACON, + "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n", + bs.bs_bmissthreshold, bs.bs_sleepduration, + bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext); + + /* Set the computed STA beacon timers */ + + ath9k_hw_set_interrupts(sc->sc_ah, 0); + ath9k_hw_set_sta_beacon_timers(sc->sc_ah, &bs); + sc->imask |= ATH9K_INT_BMISS; + ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); +} + +static void ath_beacon_config_adhoc(struct ath_softc *sc, + struct ath_beacon_config *conf, + struct ieee80211_vif *vif) +{ + u64 tsf; + u32 tsftu, intval, nexttbtt; + + intval = conf->beacon_interval & ATH9K_BEACON_PERIOD; + + /* + * It looks like mac80211 may end up using beacon interval of zero in + * some cases (at least for mesh point). Avoid getting into an + * infinite loop by using a bit safer value instead.. + */ + if (intval == 0) + intval = 100; + + /* Pull nexttbtt forward to reflect the current TSF */ + + nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp); + if (nexttbtt == 0) + nexttbtt = intval; + else if (intval) + nexttbtt = roundup(nexttbtt, intval); + + tsf = ath9k_hw_gettsf64(sc->sc_ah); + tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE; + do { + nexttbtt += intval; + } while (nexttbtt < tsftu); + + DPRINTF(sc, ATH_DBG_BEACON, + "IBSS nexttbtt %u intval %u (%u)\n", + nexttbtt, intval, conf->beacon_interval); + + /* + * In IBSS mode enable the beacon timers but only enable SWBA interrupts + * if we need to manually prepare beacon frames. Otherwise we use a + * self-linked tx descriptor and let the hardware deal with things. + */ + intval |= ATH9K_BEACON_ENA; + if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) + sc->imask |= ATH9K_INT_SWBA; + + ath_beaconq_config(sc); + + /* Set the computed ADHOC beacon timers */ + + ath9k_hw_set_interrupts(sc->sc_ah, 0); + ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval); + sc->beacon.bmisscnt = 0; + ath9k_hw_set_interrupts(sc->sc_ah, sc->imask); + + /* FIXME: Handle properly when vif is NULL */ + if (vif && sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL) + ath_beacon_start_adhoc(sc, vif); +} + +void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + enum nl80211_iftype iftype; + + /* Setup the beacon configuration parameters */ + + if (vif) { + struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; + + iftype = vif->type; + + cur_conf->beacon_interval = bss_conf->beacon_int; + cur_conf->dtim_period = bss_conf->dtim_period; + cur_conf->listen_interval = 1; + cur_conf->dtim_count = 1; + cur_conf->bmiss_timeout = + ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; + } else { + iftype = sc->sc_ah->opmode; + } + + + switch (iftype) { + case NL80211_IFTYPE_AP: + ath_beacon_config_ap(sc, cur_conf); + break; + case NL80211_IFTYPE_ADHOC: + case NL80211_IFTYPE_MESH_POINT: + ath_beacon_config_adhoc(sc, cur_conf, vif); + break; + case NL80211_IFTYPE_STATION: + ath_beacon_config_sta(sc, cur_conf); + break; + default: + DPRINTF(sc, ATH_DBG_CONFIG, + "Unsupported beaconing mode\n"); + return; + } + + sc->sc_flags |= SC_OP_BEACONS; +} |