ath9k: Add new Atheros IEEE 802.11n driver
This adds the new mac80211 11n ath9k Atheros driver. Only STA support
is currently enabled and tested.
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Jack Howarth <howarth@bromo.msbb.uc.edu>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/beacon.c b/drivers/net/wireless/ath9k/beacon.c
new file mode 100644
index 0000000..00993f8
--- /dev/null
+++ b/drivers/net/wireless/ath9k/beacon.c
@@ -0,0 +1,977 @@
+/*
+ * 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 <asm/unaligned.h>
+#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(get_unaligned_le32(conf.u.last_tstamp + 4),
+ get_unaligned_le32(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 =
+ 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 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;
+}