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Diffstat (limited to 'drivers/net/wireless/ath/ath9k/beacon.c')
-rw-r--r--drivers/net/wireless/ath/ath9k/beacon.c767
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 000000000000..3639a2e6987d
--- /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;
+}