diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/beacon.c')
-rw-r--r-- | drivers/net/wireless/ath/ath9k/beacon.c | 781 |
1 files changed, 781 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 0000000..2ff570f --- /dev/null +++ b/drivers/net/wireless/ath/ath9k/beacon.c @@ -0,0 +1,781 @@ +/* + * Copyright (c) 2008-2011 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 <linux/dma-mapping.h> +#include "ath9k.h" + +#define FUDGE 2 + +static void ath9k_reset_beacon_status(struct ath_softc *sc) +{ + sc->beacon.tx_processed = false; + sc->beacon.tx_last = false; +} + +/* + * 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 void ath9k_beaconq_config(struct ath_softc *sc) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath9k_tx_queue_info qi, qi_be; + struct ath_txq *txq; + + 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. */ + txq = sc->tx.txq_map[IEEE80211_AC_BE]; + ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be); + qi.tqi_aifs = qi_be.tqi_aifs; + if (ah->slottime == ATH9K_SLOT_TIME_20) + qi.tqi_cwmin = 2*qi_be.tqi_cwmin; + else + qi.tqi_cwmin = 4*qi_be.tqi_cwmin; + qi.tqi_cwmax = qi_be.tqi_cwmax; + } + + if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) { + ath_err(common, "Unable to update h/w beacon queue parameters\n"); + } else { + ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); + } +} + +/* + * Associates the beacon frame buffer with a transmit descriptor. Will set + * up rate codes, and channel flags. Beacons are always sent out at the + * lowest rate, and are not retried. +*/ +static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif, + struct ath_buf *bf, int rateidx) +{ + struct sk_buff *skb = bf->bf_mpdu; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath_tx_info info; + struct ieee80211_supported_band *sband; + u8 chainmask = ah->txchainmask; + u8 rate = 0; + + sband = &sc->sbands[common->hw->conf.chandef.chan->band]; + rate = sband->bitrates[rateidx].hw_value; + if (vif->bss_conf.use_short_preamble) + rate |= sband->bitrates[rateidx].hw_value_short; + + memset(&info, 0, sizeof(info)); + info.pkt_len = skb->len + FCS_LEN; + info.type = ATH9K_PKT_TYPE_BEACON; + info.txpower = MAX_RATE_POWER; + info.keyix = ATH9K_TXKEYIX_INVALID; + info.keytype = ATH9K_KEY_TYPE_CLEAR; + info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK; + + info.buf_addr[0] = bf->bf_buf_addr; + info.buf_len[0] = roundup(skb->len, 4); + + info.is_first = true; + info.is_last = true; + + info.qcu = sc->beacon.beaconq; + + info.rates[0].Tries = 1; + info.rates[0].Rate = rate; + info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate); + + ath9k_hw_set_txdesc(ah, bf->bf_desc, &info); +} + +static void ath9k_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb) +{ + struct ath_softc *sc = hw->priv; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_tx_control txctl; + + memset(&txctl, 0, sizeof(struct ath_tx_control)); + txctl.txq = sc->beacon.cabq; + + ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb); + + if (ath_tx_start(hw, skb, &txctl) != 0) { + ath_dbg(common, XMIT, "CABQ TX failed\n"); + ieee80211_free_txskb(hw, skb); + } +} + +static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw, + struct ieee80211_vif *vif) +{ + struct ath_softc *sc = hw->priv; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_buf *bf; + struct ath_vif *avp = (void *)vif->drv_priv; + struct sk_buff *skb; + struct ath_txq *cabq = sc->beacon.cabq; + struct ieee80211_tx_info *info; + struct ieee80211_mgmt *mgmt_hdr; + int cabq_depth; + + if (avp->av_bcbuf == NULL) + return NULL; + + bf = avp->av_bcbuf; + skb = bf->bf_mpdu; + if (skb) { + dma_unmap_single(sc->dev, bf->bf_buf_addr, + skb->len, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); + bf->bf_buf_addr = 0; + bf->bf_mpdu = NULL; + } + + skb = ieee80211_beacon_get(hw, vif); + if (skb == NULL) + return NULL; + + bf->bf_mpdu = skb; + + mgmt_hdr = (struct ieee80211_mgmt *)skb->data; + mgmt_hdr->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 = 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; + bf->bf_buf_addr = 0; + ath_err(common, "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) { + ath_dbg(common, BEACON, + "Flushing previous cabq traffic\n"); + ath_draintxq(sc, cabq); + } + } + + ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx); + + while (skb) { + ath9k_tx_cabq(hw, skb); + skb = ieee80211_get_buffered_bc(hw, vif); + } + + return bf; +} + +void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_vif *avp = (void *)vif->drv_priv; + int slot; + + avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list); + list_del(&avp->av_bcbuf->list); + + for (slot = 0; slot < ATH_BCBUF; slot++) { + if (sc->beacon.bslot[slot] == NULL) { + avp->av_bslot = slot; + break; + } + } + + sc->beacon.bslot[avp->av_bslot] = vif; + sc->nbcnvifs++; + + ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n", + avp->av_bslot); +} + +void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_vif *avp = (void *)vif->drv_priv; + struct ath_buf *bf = avp->av_bcbuf; + + ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n", + avp->av_bslot); + + tasklet_disable(&sc->bcon_tasklet); + + if (bf && bf->bf_mpdu) { + struct sk_buff *skb = bf->bf_mpdu; + dma_unmap_single(sc->dev, bf->bf_buf_addr, + skb->len, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); + bf->bf_mpdu = NULL; + bf->bf_buf_addr = 0; + } + + avp->av_bcbuf = NULL; + sc->beacon.bslot[avp->av_bslot] = NULL; + sc->nbcnvifs--; + list_add_tail(&bf->list, &sc->beacon.bbuf); + + tasklet_enable(&sc->bcon_tasklet); +} + +static int ath9k_beacon_choose_slot(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + u16 intval; + u32 tsftu; + u64 tsf; + int slot; + + if (sc->sc_ah->opmode != NL80211_IFTYPE_AP) { + ath_dbg(common, BEACON, "slot 0, tsf: %llu\n", + ath9k_hw_gettsf64(sc->sc_ah)); + return 0; + } + + intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL; + tsf = ath9k_hw_gettsf64(sc->sc_ah); + tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time); + tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF); + slot = (tsftu % (intval * ATH_BCBUF)) / intval; + + ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n", + slot, tsf, tsftu / ATH_BCBUF); + + return slot; +} + +void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + struct ath_vif *avp = (void *)vif->drv_priv; + u64 tsfadjust; + + if (avp->av_bslot == 0) + return; + + tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF; + avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust)); + + ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", + (unsigned long long)tsfadjust, avp->av_bslot); +} + +void ath9k_beacon_tasklet(unsigned long data) +{ + struct ath_softc *sc = (struct ath_softc *)data; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath_buf *bf = NULL; + struct ieee80211_vif *vif; + bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); + int slot; + + if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) { + ath_dbg(common, RESET, + "reset work is pending, skip beaconing now\n"); + return; + } + + /* + * 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 (!ath9k_hw_check_alive(ah)) + ieee80211_queue_work(sc->hw, &sc->hw_check_work); + + if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) { + ath_dbg(common, BSTUCK, + "missed %u consecutive beacons\n", + sc->beacon.bmisscnt); + ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq); + if (sc->beacon.bmisscnt > 3) + ath9k_hw_bstuck_nfcal(ah); + } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) { + ath_dbg(common, BSTUCK, "beacon is officially stuck\n"); + sc->beacon.bmisscnt = 0; + ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK); + } + + return; + } + + slot = ath9k_beacon_choose_slot(sc); + vif = sc->beacon.bslot[slot]; + + if (!vif || !vif->bss_conf.enable_beacon) + return; + + bf = ath9k_beacon_generate(sc->hw, vif); + + if (sc->beacon.bmisscnt != 0) { + ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n", + sc->beacon.bmisscnt); + sc->beacon.bmisscnt = 0; + } + + /* + * 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; + sc->beacon.slotupdate = slot; + } else if (sc->beacon.updateslot == COMMIT && + sc->beacon.slotupdate == slot) { + ah->slottime = sc->beacon.slottime; + ath9k_hw_init_global_settings(ah); + sc->beacon.updateslot = OK; + } + + if (bf) { + ath9k_reset_beacon_status(sc); + + ath_dbg(common, BEACON, + "Transmitting beacon for slot: %d\n", slot); + + /* NB: cabq traffic should already be queued and primed */ + ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr); + + if (!edma) + ath9k_hw_txstart(ah, sc->beacon.beaconq); + } +} + +/* + * Both nexttbtt and intval have to be in usecs. + */ +static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, + u32 intval, bool reset_tsf) +{ + struct ath_hw *ah = sc->sc_ah; + + ath9k_hw_disable_interrupts(ah); + if (reset_tsf) + ath9k_hw_reset_tsf(ah); + ath9k_beaconq_config(sc); + ath9k_hw_beaconinit(ah, nexttbtt, intval); + sc->beacon.bmisscnt = 0; + ath9k_hw_set_interrupts(ah); + ath9k_hw_enable_interrupts(ah); +} + +/* + * 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 ath9k_beacon_config_ap(struct ath_softc *sc, + struct ath_beacon_config *conf) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + u32 nexttbtt, intval; + + /* NB: the beacon interval is kept internally in TU's */ + intval = TU_TO_USEC(conf->beacon_interval); + intval /= ATH_BCBUF; + nexttbtt = intval; + + if (conf->enable_beacon) + ah->imask |= ATH9K_INT_SWBA; + else + ah->imask &= ~ATH9K_INT_SWBA; + + ath_dbg(common, BEACON, + "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n", + (conf->enable_beacon) ? "Enable" : "Disable", + nexttbtt, intval, conf->beacon_interval); + + ath9k_beacon_init(sc, nexttbtt, intval, true); +} + +/* + * 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 ath9k_beacon_config_sta(struct ath_softc *sc, + struct ath_beacon_config *conf) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + 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; + + /* No need to configure beacon if we are not associated */ + if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) { + ath_dbg(common, BEACON, + "STA is not yet associated..skipping beacon config\n"); + return; + } + + memset(&bs, 0, sizeof(bs)); + intval = conf->beacon_interval; + + /* + * Setup dtim and cfp parameters according to + * last beacon we received (which may be none). + */ + dtimperiod = conf->dtim_period; + 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; + + /* + * Pull nexttbtt forward to reflect the current + * TSF and calculate dtim+cfp state for the result. + */ + tsf = ath9k_hw_gettsf64(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; + + ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu); + ath_dbg(common, 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_disable_interrupts(ah); + ath9k_hw_set_sta_beacon_timers(ah, &bs); + ah->imask |= ATH9K_INT_BMISS; + + ath9k_hw_set_interrupts(ah); + ath9k_hw_enable_interrupts(ah); +} + +static void ath9k_beacon_config_adhoc(struct ath_softc *sc, + struct ath_beacon_config *conf) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + u32 intval, nexttbtt; + + ath9k_reset_beacon_status(sc); + + intval = TU_TO_USEC(conf->beacon_interval); + + if (conf->ibss_creator) { + nexttbtt = intval; + } else { + u32 tbtt, offset, tsftu; + u64 tsf; + + /* + * Pull nexttbtt forward to reflect the current + * sync'd TSF. + */ + tsf = ath9k_hw_gettsf64(ah); + tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE; + offset = tsftu % conf->beacon_interval; + tbtt = tsftu - offset; + if (offset) + tbtt += conf->beacon_interval; + + nexttbtt = TU_TO_USEC(tbtt); + } + + if (conf->enable_beacon) + ah->imask |= ATH9K_INT_SWBA; + else + ah->imask &= ~ATH9K_INT_SWBA; + + ath_dbg(common, BEACON, + "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n", + (conf->enable_beacon) ? "Enable" : "Disable", + nexttbtt, intval, conf->beacon_interval); + + ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator); + + /* + * Set the global 'beacon has been configured' flag for the + * joiner case in IBSS mode. + */ + if (!conf->ibss_creator && conf->enable_beacon) + set_bit(SC_OP_BEACONS, &sc->sc_flags); +} + +bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_vif *avp = (void *)vif->drv_priv; + + if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) { + if ((vif->type != NL80211_IFTYPE_AP) || + (sc->nbcnvifs > 1)) { + ath_dbg(common, CONFIG, + "An AP interface is already present !\n"); + return false; + } + } + + if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { + if ((vif->type == NL80211_IFTYPE_STATION) && + test_bit(SC_OP_BEACONS, &sc->sc_flags) && + !avp->primary_sta_vif) { + ath_dbg(common, CONFIG, + "Beacon already configured for a station interface\n"); + return false; + } + } + + return true; +} + +static void ath9k_cache_beacon_config(struct ath_softc *sc, + struct ieee80211_bss_conf *bss_conf) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + + ath_dbg(common, BEACON, + "Caching beacon data for BSS: %pM\n", bss_conf->bssid); + + 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->ibss_creator = bss_conf->ibss_creator; + cur_conf->bmiss_timeout = + ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval; + + /* + * 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. To be safe, + * do sanity check on beacon interval for all operating modes. + */ + if (cur_conf->beacon_interval == 0) + cur_conf->beacon_interval = 100; + + /* + * We don't parse dtim period from mac80211 during the driver + * initialization as it breaks association with hidden-ssid + * AP and it causes latency in roaming + */ + if (cur_conf->dtim_period == 0) + cur_conf->dtim_period = 1; + +} + +void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif, + u32 changed) +{ + struct ieee80211_bss_conf *bss_conf = &vif->bss_conf; + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + unsigned long flags; + bool skip_beacon = false; + + if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) { + ath9k_cache_beacon_config(sc, bss_conf); + ath9k_set_beacon(sc); + set_bit(SC_OP_BEACONS, &sc->sc_flags); + return; + + } + + /* + * Take care of multiple interfaces when + * enabling/disabling SWBA. + */ + if (changed & BSS_CHANGED_BEACON_ENABLED) { + if (!bss_conf->enable_beacon && + (sc->nbcnvifs <= 1)) { + cur_conf->enable_beacon = false; + } else if (bss_conf->enable_beacon) { + cur_conf->enable_beacon = true; + ath9k_cache_beacon_config(sc, bss_conf); + } + } + + /* + * Configure the HW beacon registers only when we have a valid + * beacon interval. + */ + if (cur_conf->beacon_interval) { + /* + * If we are joining an existing IBSS network, start beaconing + * only after a TSF-sync has taken place. Ensure that this + * happens by setting the appropriate flags. + */ + if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator && + bss_conf->enable_beacon) { + spin_lock_irqsave(&sc->sc_pm_lock, flags); + sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON; + spin_unlock_irqrestore(&sc->sc_pm_lock, flags); + skip_beacon = true; + } else { + ath9k_set_beacon(sc); + } + + /* + * Do not set the SC_OP_BEACONS flag for IBSS joiner mode + * here, it is done in ath9k_beacon_config_adhoc(). + */ + if (cur_conf->enable_beacon && !skip_beacon) + set_bit(SC_OP_BEACONS, &sc->sc_flags); + else + clear_bit(SC_OP_BEACONS, &sc->sc_flags); + } +} + +void ath9k_set_beacon(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf; + + switch (sc->sc_ah->opmode) { + case NL80211_IFTYPE_AP: + ath9k_beacon_config_ap(sc, cur_conf); + break; + case NL80211_IFTYPE_ADHOC: + case NL80211_IFTYPE_MESH_POINT: + ath9k_beacon_config_adhoc(sc, cur_conf); + break; + case NL80211_IFTYPE_STATION: + ath9k_beacon_config_sta(sc, cur_conf); + break; + default: + ath_dbg(common, CONFIG, "Unsupported beaconing mode\n"); + return; + } +} |