+++ /dev/null
-/*
- * Copyright (c) 2008 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.
- */
-
- /* Implementation of beacon processing. */
-
-#include "core.h"
-
-/*
- * Configure parameters for the beacon queue
- *
- * 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_hal *ah = sc->sc_ah;
- struct ath9k_txq_info qi;
-
- ath9k_hw_gettxqueueprops(ah, sc->sc_bhalq, &qi);
- if (sc->sc_opmode == ATH9K_M_HOSTAP) {
- /* 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->sc_beacon_qi.tqi_aifs;
- qi.tqi_cwmin = 2*sc->sc_beacon_qi.tqi_cwmin;
- qi.tqi_cwmax = sc->sc_beacon_qi.tqi_cwmax;
- }
-
- if (!ath9k_hw_settxqueueprops(ah, sc->sc_bhalq, &qi)) {
- DPRINTF(sc, ATH_DBG_FATAL,
- "%s: unable to update h/w beacon queue parameters\n",
- __func__);
- return 0;
- } else {
- ath9k_hw_resettxqueue(ah, sc->sc_bhalq); /* push to h/w */
- return 1;
- }
-}
-
-/*
- * Setup the beacon frame for transmit.
- *
- * 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_vap *avp, struct ath_buf *bf)
-{
- struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
- struct ath_hal *ah = sc->sc_ah;
- struct ath_desc *ds;
- int flags, antenna;
- const struct ath9k_rate_table *rt;
- u8 rix, rate;
- int ctsrate = 0;
- int ctsduration = 0;
- struct ath9k_11n_rate_series series[4];
-
- DPRINTF(sc, ATH_DBG_BEACON, "%s: m %p len %u\n",
- __func__, skb, skb->len);
-
- /* setup descriptors */
- ds = bf->bf_desc;
-
- flags = ATH9K_TXDESC_NOACK;
-
- if (sc->sc_opmode == ATH9K_M_IBSS && ah->ah_caps.halVEOLSupport) {
- 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's
- * XXX assumes two antenna
- */
- antenna = ((sc->ast_be_xmit / sc->sc_nbcnvaps) & 1 ? 2 : 1);
- }
-
- ds->ds_data = bf->bf_buf_addr;
-
- /*
- * Calculate rate code.
- * XXX everything at min xmit rate
- */
- rix = sc->sc_minrateix;
- rt = sc->sc_currates;
- rate = rt->info[rix].rateCode;
- if (sc->sc_flags & ATH_PREAMBLE_SHORT)
- rate |= rt->info[rix].shortPreamble;
-
- ath9k_hw_set11n_txdesc(ah, ds
- , skb->len + FCS_LEN /* frame length */
- , ATH9K_PKT_TYPE_BEACON /* Atheros packet type */
- , avp->av_btxctl.txpower /* txpower XXX */
- , ATH9K_TXKEYIX_INVALID /* no encryption */
- , ATH9K_KEY_TYPE_CLEAR /* no encryption */
- , flags /* no ack, veol for beacons */
- );
-
- /* NB: beacon's BufLen must be a multiple of 4 bytes */
- ath9k_hw_filltxdesc(ah, ds
- , roundup(skb->len, 4) /* buffer length */
- , true /* first segment */
- , true /* last segment */
- , ds /* first descriptor */
- );
-
- memzero(series, sizeof(struct ath9k_11n_rate_series) * 4);
- series[0].Tries = 1;
- series[0].Rate = rate;
- series[0].ChSel = sc->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);
-}
-
-/* Move everything from the vap's mcast queue to the hardware cab queue.
- * Caller must hold mcasq lock and cabq lock
- * XXX MORE_DATA bit?
- */
-static void empty_mcastq_into_cabq(struct ath_hal *ah,
- struct ath_txq *mcastq, struct ath_txq *cabq)
-{
- struct ath_buf *bfmcast;
-
- BUG_ON(list_empty(&mcastq->axq_q));
-
- bfmcast = list_first_entry(&mcastq->axq_q, struct ath_buf, list);
-
- /* link the descriptors */
- if (!cabq->axq_link)
- ath9k_hw_puttxbuf(ah, cabq->axq_qnum, bfmcast->bf_daddr);
- else
- *cabq->axq_link = bfmcast->bf_daddr;
-
- /* append the private vap mcast list to the cabq */
-
- cabq->axq_depth += mcastq->axq_depth;
- cabq->axq_totalqueued += mcastq->axq_totalqueued;
- cabq->axq_linkbuf = mcastq->axq_linkbuf;
- cabq->axq_link = mcastq->axq_link;
- list_splice_tail_init(&mcastq->axq_q, &cabq->axq_q);
- mcastq->axq_depth = 0;
- mcastq->axq_totalqueued = 0;
- mcastq->axq_linkbuf = NULL;
- mcastq->axq_link = NULL;
-}
-
-/* This is only run at DTIM. We move everything from the vap's mcast queue
- * to the hardware cab queue. Caller must hold the mcastq lock. */
-static void trigger_mcastq(struct ath_hal *ah,
- struct ath_txq *mcastq, struct ath_txq *cabq)
-{
- spin_lock_bh(&cabq->axq_lock);
-
- if (!list_empty(&mcastq->axq_q))
- empty_mcastq_into_cabq(ah, mcastq, cabq);
-
- /* cabq is gated by beacon so it is safe to start here */
- if (!list_empty(&cabq->axq_q))
- ath9k_hw_txstart(ah, cabq->axq_qnum);
-
- spin_unlock_bh(&cabq->axq_lock);
-}
-
-/*
- * Generate beacon frame and queue cab data for a vap.
- *
- * Updates the contents of the beacon frame. It is assumed that the buffer for
- * the beacon frame has been allocated in the ATH object, and simply needs to
- * be filled for this cycle. Also, any CAB (crap after beacon?) traffic will
- * be added to the beacon frame at this point.
-*/
-static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
-{
- struct ath_hal *ah = sc->sc_ah;
- struct ath_buf *bf;
- struct ath_vap *avp;
- struct sk_buff *skb;
- int cabq_depth;
- int mcastq_depth;
- int is_beacon_dtim = 0;
- unsigned int curlen;
- struct ath_txq *cabq;
- struct ath_txq *mcastq;
- avp = sc->sc_vaps[if_id];
-
- mcastq = &avp->av_mcastq;
- cabq = sc->sc_cabq;
-
- ASSERT(avp);
-
- if (avp->av_bcbuf == NULL) {
- DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n",
- __func__, avp, avp->av_bcbuf);
- return NULL;
- }
- bf = avp->av_bcbuf;
- skb = (struct sk_buff *) bf->bf_mpdu;
-
- /*
- * Update dynamic beacon contents. If this returns
- * non-zero then we need to remap the memory because
- * the beacon frame changed size (probably because
- * of the TIM bitmap).
- */
- curlen = skb->len;
-
- /* XXX: spin_lock_bh should not be used here, but sparse bitches
- * otherwise. We should fix sparse :) */
- spin_lock_bh(&mcastq->axq_lock);
- mcastq_depth = avp->av_mcastq.axq_depth;
-
- if (ath_update_beacon(sc, if_id, &avp->av_boff, skb, mcastq_depth) ==
- 1) {
- ath_skb_unmap_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- bf->bf_buf_addr = ath_skb_map_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- } else {
- pci_dma_sync_single_for_cpu(sc->pdev,
- bf->bf_buf_addr,
- skb_tailroom(skb),
- PCI_DMA_TODEVICE);
- }
-
- /*
- * if the CABQ traffic from previous DTIM is pending and the current
- * beacon is also a DTIM.
- * 1) if there is only one vap let the cab traffic continue.
- * 2) if there are more than one vap and we are using staggered
- * beacons, then drain the cabq by dropping all the frames in
- * the cabq so that the current vaps cab traffic can be scheduled.
- */
- spin_lock_bh(&cabq->axq_lock);
- cabq_depth = cabq->axq_depth;
- spin_unlock_bh(&cabq->axq_lock);
-
- is_beacon_dtim = avp->av_boff.bo_tim[4] & 1;
-
- if (mcastq_depth && is_beacon_dtim && cabq_depth) {
- /*
- * Unlock the cabq lock as ath_tx_draintxq acquires
- * the lock again which is a common function and that
- * acquires txq lock inside.
- */
- if (sc->sc_nvaps > 1) {
- ath_tx_draintxq(sc, cabq, false);
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: flush previous cabq traffic\n", __func__);
- }
- }
-
- /* Construct tx descriptor. */
- ath_beacon_setup(sc, avp, bf);
-
- /*
- * Enable the CAB queue before the beacon queue to
- * insure cab frames are triggered by this beacon.
- */
- if (is_beacon_dtim)
- trigger_mcastq(ah, mcastq, cabq);
-
- spin_unlock_bh(&mcastq->axq_lock);
- 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, int if_id)
-{
- struct ath_hal *ah = sc->sc_ah;
- struct ath_buf *bf;
- struct ath_vap *avp;
- struct sk_buff *skb;
-
- avp = sc->sc_vaps[if_id];
- ASSERT(avp);
-
- if (avp->av_bcbuf == NULL) {
- DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n",
- __func__, avp, avp != NULL ? avp->av_bcbuf : NULL);
- return;
- }
- bf = avp->av_bcbuf;
- skb = (struct sk_buff *) bf->bf_mpdu;
-
- /* Construct tx descriptor. */
- ath_beacon_setup(sc, avp, bf);
-
- /* NB: caller is known to have already stopped tx dma */
- ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bf->bf_daddr);
- ath9k_hw_txstart(ah, sc->sc_bhalq);
- DPRINTF(sc, ATH_DBG_BEACON, "%s: TXDP%u = %llx (%p)\n", __func__,
- sc->sc_bhalq, ito64(bf->bf_daddr), bf->bf_desc);
-}
-
-/*
- * Setup a h/w transmit queue for beacons.
- *
- * This function allocates an information structure (struct ath9k_txq_info)
- * on the stack, sets some specific parameters (zero out channel width
- * min/max, and enable aifs). The info structure does not need to be
- * persistant.
-*/
-
-int ath_beaconq_setup(struct ath_hal *ah)
-{
- struct ath9k_txq_info qi;
-
- memzero(&qi, 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);
-}
-
-
-/*
- * Allocate and setup an initial beacon frame.
- *
- * Allocate a beacon state variable for a specific VAP instance created on
- * the ATH interface. This routine also calculates the beacon "slot" for
- * staggared beacons in the mBSSID case.
-*/
-
-int ath_beacon_alloc(struct ath_softc *sc, int if_id)
-{
- struct ath_vap *avp;
- struct ieee80211_hdr *wh;
- struct ath_buf *bf;
- struct sk_buff *skb;
-
- avp = sc->sc_vaps[if_id];
- ASSERT(avp);
-
- /* 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->sc_bbuf,
- struct ath_buf, list);
- list_del(&avp->av_bcbuf->list);
-
- if (sc->sc_opmode == ATH9K_M_HOSTAP ||
- !sc->sc_ah->ah_caps.halVEOLSupport) {
- int slot;
- /*
- * Assign the vap 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->sc_bslot[slot] == ATH_IF_ID_ANY) {
- /*
- * XXX hack, space out slots to better
- * deal with misses
- */
- if (slot+1 < ATH_BCBUF &&
- sc->sc_bslot[slot+1] ==
- ATH_IF_ID_ANY) {
- avp->av_bslot = slot+1;
- break;
- }
- avp->av_bslot = slot;
- /* NB: keep looking for a double slot */
- }
- BUG_ON(sc->sc_bslot[avp->av_bslot] != ATH_IF_ID_ANY);
- sc->sc_bslot[avp->av_bslot] = if_id;
- sc->sc_nbcnvaps++;
- }
- }
-
- /* release the previous beacon frame , if it already exists. */
- bf = avp->av_bcbuf;
- if (bf->bf_mpdu != NULL) {
- skb = (struct sk_buff *)bf->bf_mpdu;
- ath_skb_unmap_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- dev_kfree_skb_any(skb);
- bf->bf_mpdu = NULL;
- }
-
- /*
- * NB: the beacon data buffer must be 32-bit aligned;
- * we assume the wbuf routines will return us something
- * with this alignment (perhaps should assert).
- * FIXME: Fill avp->av_boff.bo_tim,avp->av_btxctl.txpower and
- * avp->av_btxctl.shortPreamble
- */
- skb = ieee80211_beacon_get(sc->hw, avp->av_if_data);
- if (skb == NULL) {
- DPRINTF(sc, ATH_DBG_BEACON, "%s: cannot get skb\n",
- __func__);
- return -ENOMEM;
- }
-
- /*
- * Calculate a TSF adjustment factor required for
- * staggered beacons. Note that we assume the format
- * of the beacon frame leaves the tstamp field immediately
- * following the header.
- */
- if (avp->av_bslot > 0) {
- u64 tsfadjust;
- __le64 val;
- int intval;
-
- /* FIXME: Use default value for now: Sujith */
-
- intval = ATH_DEFAULT_BINTVAL;
-
- /*
- * The beacon interval is in TU's; the TSF in usecs.
- * We figure out how many TU's to add to align the
- * timestamp then convert to TSF units and handle
- * byte swapping before writing it in the frame.
- * The hardware will then add this each time a beacon
- * frame is sent. Note that we align vap's 1..N
- * and leave vap 0 untouched. This means vap 0
- * has a timestamp in one beacon interval while the
- * others get a timestamp aligned to the next interval.
- */
- tsfadjust = (intval * (ATH_BCBUF - avp->av_bslot)) / ATH_BCBUF;
- val = cpu_to_le64(tsfadjust << 10); /* TU->TSF */
-
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: %s beacons, bslot %d intval %u tsfadjust %llu\n",
- __func__, "stagger",
- avp->av_bslot, intval, (unsigned long long)tsfadjust);
-
- wh = (struct ieee80211_hdr *)skb->data;
- memcpy(&wh[1], &val, sizeof(val));
- }
-
- bf->bf_buf_addr = ath_skb_map_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- bf->bf_mpdu = skb;
-
- return 0;
-}
-
-/*
- * Reclaim beacon resources and return buffer to the pool.
- *
- * Checks the VAP to put the beacon frame buffer back to the ATH object
- * queue, and de-allocates any wbuf frames that were sent as CAB traffic.
-*/
-
-void ath_beacon_return(struct ath_softc *sc, struct ath_vap *avp)
-{
- if (avp->av_bcbuf != NULL) {
- struct ath_buf *bf;
-
- if (avp->av_bslot != -1) {
- sc->sc_bslot[avp->av_bslot] = ATH_IF_ID_ANY;
- sc->sc_nbcnvaps--;
- }
-
- bf = avp->av_bcbuf;
- if (bf->bf_mpdu != NULL) {
- struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
- ath_skb_unmap_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- dev_kfree_skb_any(skb);
- bf->bf_mpdu = NULL;
- }
- list_add_tail(&bf->list, &sc->sc_bbuf);
-
- avp->av_bcbuf = NULL;
- }
-}
-
-/*
- * Reclaim beacon resources and return buffer to the pool.
- *
- * This function will free any wbuf frames that are still attached to the
- * beacon buffers in the ATH object. Note that this does not de-allocate
- * any wbuf objects that are in the transmit queue and have not yet returned
- * to the ATH object.
-*/
-
-void ath_beacon_free(struct ath_softc *sc)
-{
- struct ath_buf *bf;
-
- list_for_each_entry(bf, &sc->sc_bbuf, list) {
- if (bf->bf_mpdu != NULL) {
- struct sk_buff *skb = (struct sk_buff *) bf->bf_mpdu;
- ath_skb_unmap_single(sc, skb, PCI_DMA_TODEVICE,
- get_dma_mem_context(bf, bf_dmacontext));
- dev_kfree_skb_any(skb);
- bf->bf_mpdu = NULL;
- }
- }
-}
-
-/*
- * Tasklet for Sending Beacons
- *
- * Transmit one or more beacon frames at SWBA. Dynamic updates to the frame
- * contents are done as needed and the slot time is also adjusted based on
- * current state.
- *
- * This tasklet is not scheduled, it's called in ISR context.
-*/
-
-void ath9k_beacon_tasklet(unsigned long data)
-{
-#define TSF_TO_TU(_h,_l) \
- ((((u32)(_h)) << 22) | (((u32)(_l)) >> 10))
-
- struct ath_softc *sc = (struct ath_softc *)data;
- struct ath_hal *ah = sc->sc_ah;
- struct ath_buf *bf = NULL;
- int slot, if_id;
- u32 bfaddr;
- u32 rx_clear = 0, rx_frame = 0, tx_frame = 0;
- u32 show_cycles = 0;
- u32 bc = 0; /* beacon count */
- u64 tsf;
- u32 tsftu;
- u16 intval;
-
- if (sc->sc_noreset) {
- show_cycles = ath9k_hw_GetMibCycleCountsPct(ah,
- &rx_clear,
- &rx_frame,
- &tx_frame);
- }
-
- /*
- * 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->sc_bhalq) != 0) {
- sc->sc_bmisscount++;
- /* XXX: doth needs the chanchange IE countdown decremented.
- * We should consider adding a mac80211 call to indicate
- * a beacon miss so appropriate action could be taken
- * (in that layer).
- */
- if (sc->sc_bmisscount < BSTUCK_THRESH) {
- if (sc->sc_noreset) {
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: missed %u consecutive beacons\n",
- __func__, sc->sc_bmisscount);
- if (show_cycles) {
- /*
- * Display cycle counter stats
- * from HW to aide in debug of
- * stickiness.
- */
- DPRINTF(sc,
- ATH_DBG_BEACON,
- "%s: busy times: rx_clear=%d, "
- "rx_frame=%d, tx_frame=%d\n",
- __func__, rx_clear, rx_frame,
- tx_frame);
- } else {
- DPRINTF(sc,
- ATH_DBG_BEACON,
- "%s: unable to obtain "
- "busy times\n", __func__);
- }
- } else {
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: missed %u consecutive beacons\n",
- __func__, sc->sc_bmisscount);
- }
- } else if (sc->sc_bmisscount >= BSTUCK_THRESH) {
- if (sc->sc_noreset) {
- if (sc->sc_bmisscount == BSTUCK_THRESH) {
- DPRINTF(sc,
- ATH_DBG_BEACON,
- "%s: beacon is officially "
- "stuck\n", __func__);
- ath9k_hw_dmaRegDump(ah);
- }
- } else {
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: beacon is officially stuck\n",
- __func__);
- ath_bstuck_process(sc);
- }
- }
-
- return;
- }
- if (sc->sc_bmisscount != 0) {
- if (sc->sc_noreset) {
- DPRINTF(sc,
- ATH_DBG_BEACON,
- "%s: resume beacon xmit after %u misses\n",
- __func__, sc->sc_bmisscount);
- } else {
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: resume beacon xmit after %u misses\n",
- __func__, sc->sc_bmisscount);
- }
- sc->sc_bmisscount = 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.
- */
-
- /* FIXME: Use default value for now - Sujith */
- intval = ATH_DEFAULT_BINTVAL;
-
- tsf = ath9k_hw_gettsf64(ah);
- tsftu = TSF_TO_TU(tsf>>32, tsf);
- slot = ((tsftu % intval) * ATH_BCBUF) / intval;
- if_id = sc->sc_bslot[(slot + 1) % ATH_BCBUF];
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: slot %d [tsf %llu tsftu %u intval %u] if_id %d\n",
- __func__, slot, (unsigned long long) tsf, tsftu,
- intval, if_id);
- bfaddr = 0;
- if (if_id != ATH_IF_ID_ANY) {
- bf = ath_beacon_generate(sc, if_id);
- 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.
- */
- /* XXX locking */
- if (sc->sc_updateslot == UPDATE) {
- sc->sc_updateslot = COMMIT; /* commit next beacon */
- sc->sc_slotupdate = slot;
- } else if (sc->sc_updateslot == COMMIT && sc->sc_slotupdate == slot)
- ath_setslottime(sc); /* commit change to hardware */
-
- 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->sc_bhalq)) {
- DPRINTF(sc, ATH_DBG_FATAL,
- "%s: beacon queue %u did not stop?\n",
- __func__, sc->sc_bhalq);
- /* NB: the HAL still stops DMA, so proceed */
- }
-
- /* NB: cabq traffic should already be queued and primed */
- ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bfaddr);
- ath9k_hw_txstart(ah, sc->sc_bhalq);
-
- sc->ast_be_xmit += bc; /* XXX per-vap? */
- }
-#undef TSF_TO_TU
-}
-
-/*
- * Tasklet for Beacon Stuck processing
- *
- * Processing for Beacon Stuck.
- * Basically calls the ath_internal_reset function to reset the chip.
-*/
-
-void ath_bstuck_process(struct ath_softc *sc)
-{
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: stuck beacon; resetting (bmiss count %u)\n",
- __func__, sc->sc_bmisscount);
- ath_internal_reset(sc);
-}
-
-/*
- * Configure the beacon and sleep timers.
- *
- * When operating as an AP this resets the TSF and sets
- * up the hardware to notify us when we need to issue beacons.
- *
- * When operating in station mode 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.
- */
-
-void ath_beacon_config(struct ath_softc *sc, int if_id)
-{
-#define TSF_TO_TU(_h,_l) \
- ((((u32)(_h)) << 22) | (((u32)(_l)) >> 10))
- struct ath_hal *ah = sc->sc_ah;
- u32 nexttbtt, intval;
- struct ath_beacon_config conf;
- enum ath9k_opmode av_opmode;
-
- if (if_id != ATH_IF_ID_ANY)
- av_opmode = sc->sc_vaps[if_id]->av_opmode;
- else
- av_opmode = sc->sc_opmode;
-
- memzero(&conf, sizeof(struct ath_beacon_config));
-
- /* FIXME: Use default values for now - Sujith */
- /* Query beacon configuration first */
- /*
- * Protocol stack doesn't support dynamic beacon configuration,
- * use default configurations.
- */
- conf.beacon_interval = ATH_DEFAULT_BINTVAL;
- conf.listen_interval = 1;
- conf.dtim_period = conf.beacon_interval;
- conf.dtim_count = 1;
- conf.bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf.beacon_interval;
-
- /* extract tstamp from last beacon and convert to TU */
- nexttbtt = TSF_TO_TU(LE_READ_4(conf.u.last_tstamp + 4),
- LE_READ_4(conf.u.last_tstamp));
- /* XXX conditionalize multi-bss support? */
- if (sc->sc_opmode == ATH9K_M_HOSTAP) {
- /*
- * 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.
- */
- /* NB: the beacon interval is kept internally in TU's */
- intval = conf.beacon_interval & ATH9K_BEACON_PERIOD;
- intval /= ATH_BCBUF; /* for staggered beacons */
- } else {
- intval = conf.beacon_interval & ATH9K_BEACON_PERIOD;
- }
-
- if (nexttbtt == 0) /* e.g. for ap mode */
- nexttbtt = intval;
- else if (intval) /* NB: can be 0 for monitor mode */
- nexttbtt = roundup(nexttbtt, intval);
- DPRINTF(sc, ATH_DBG_BEACON, "%s: nexttbtt %u intval %u (%u)\n",
- __func__, nexttbtt, intval, conf.beacon_interval);
- /* Check for ATH9K_M_HOSTAP and sc_nostabeacons for WDS client */
- if (sc->sc_opmode == ATH9K_M_STA) {
- struct ath9k_beacon_state bs;
- u64 tsf;
- u32 tsftu;
- int dtimperiod, dtimcount, sleepduration;
- int cfpperiod, cfpcount;
-
- /*
- * 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; /* XXX? */
- cfpperiod = 1; /* NB: no PCF support yet */
- cfpcount = 0;
-
- sleepduration = conf.listen_interval * intval;
- if (sleepduration <= 0)
- sleepduration = intval;
-
-#define FUDGE 2
- /*
- * 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;
- do {
- nexttbtt += intval;
- if (--dtimcount < 0) {
- dtimcount = dtimperiod - 1;
- if (--cfpcount < 0)
- cfpcount = cfpperiod - 1;
- }
- } while (nexttbtt < tsftu);
-#undef FUDGE
- memzero(&bs, sizeof(bs));
- 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 =
- howmany(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 insure 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;
-
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: tsf %llu "
- "tsf:tu %u "
- "intval %u "
- "nexttbtt %u "
- "dtim %u "
- "nextdtim %u "
- "bmiss %u "
- "sleep %u "
- "cfp:period %u "
- "maxdur %u "
- "next %u "
- "timoffset %u\n"
- , __func__
- , (unsigned long long)tsf, tsftu
- , bs.bs_intval
- , bs.bs_nexttbtt
- , bs.bs_dtimperiod
- , bs.bs_nextdtim
- , bs.bs_bmissthreshold
- , bs.bs_sleepduration
- , bs.bs_cfpperiod
- , bs.bs_cfpmaxduration
- , bs.bs_cfpnext
- , bs.bs_timoffset
- );
-
- ath9k_hw_set_interrupts(ah, 0);
- ath9k_hw_set_sta_beacon_timers(ah, &bs);
- sc->sc_imask |= ATH9K_INT_BMISS;
- ath9k_hw_set_interrupts(ah, sc->sc_imask);
- } else {
- u64 tsf;
- u32 tsftu;
- ath9k_hw_set_interrupts(ah, 0);
- if (nexttbtt == intval)
- intval |= ATH9K_BEACON_RESET_TSF;
- if (sc->sc_opmode == ATH9K_M_IBSS) {
- /*
- * Pull nexttbtt forward to reflect the current
- * TSF .
- */
-#define FUDGE 2
- if (!(intval & ATH9K_BEACON_RESET_TSF)) {
- tsf = ath9k_hw_gettsf64(ah);
- tsftu = TSF_TO_TU((u32)(tsf>>32),
- (u32)tsf) + FUDGE;
- do {
- nexttbtt += intval;
- } while (nexttbtt < tsftu);
- }
-#undef FUDGE
- DPRINTF(sc, ATH_DBG_BEACON,
- "%s: IBSS nexttbtt %u intval %u (%u)\n",
- __func__, nexttbtt,
- intval & ~ATH9K_BEACON_RESET_TSF,
- 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 (!ah->ah_caps.halVEOLSupport)
- sc->sc_imask |= ATH9K_INT_SWBA;
- ath_beaconq_config(sc);
- } else if (sc->sc_opmode == ATH9K_M_HOSTAP) {
- /*
- * In AP mode we enable the beacon timers and
- * SWBA interrupts to prepare beacon frames.
- */
- intval |= ATH9K_BEACON_ENA;
- sc->sc_imask |= ATH9K_INT_SWBA; /* beacon prepare */
- ath_beaconq_config(sc);
- }
- ath9k_hw_beaconinit(ah, nexttbtt, intval);
- sc->sc_bmisscount = 0;
- ath9k_hw_set_interrupts(ah, sc->sc_imask);
- /*
- * When using a self-linked beacon descriptor in
- * ibss mode load it once here.
- */
- if (sc->sc_opmode == ATH9K_M_IBSS && ah->ah_caps.halVEOLSupport)
- ath_beacon_start_adhoc(sc, 0);
- }
-#undef TSF_TO_TU
-}
-
-/* Function to collect beacon rssi data and resync beacon if necessary */
-
-void ath_beacon_sync(struct ath_softc *sc, int if_id)
-{
- /*
- * Resync beacon timers using the tsf of the
- * beacon frame we just received.
- */
- ath_beacon_config(sc, if_id);
- sc->sc_beacons = 1;
-}
projects / openwrt / svn-archive / archive.git / blobdiff