static struct ath_buf *ath_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;
struct sk_buff *skb;
struct ath_txq *cabq;
struct ieee80211_tx_info *info;
int cabq_depth;
ath9k_reset_beacon_status(sc);
avp = (void *)vif->drv_priv;
cabq = sc->beacon.cabq;
if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
return NULL;
/* Release the old beacon first */
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;
}
/* 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 = 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, false);
}
}
ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
while (skb) {
ath_tx_cabq(hw, skb);
skb = ieee80211_get_buffered_bc(hw, vif);
}
return bf;
}
/*
* 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_buf *bf;
struct ath_vap *avp;
struct sk_buff *skb;
struct ath_txq *cabq;
struct ieee80211_tx_info *info;
int cabq_depth;
avp = sc->sc_vaps[if_id];
ASSERT(avp);
cabq = sc->sc_cabq;
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;
if (skb) {
pci_unmap_single(sc->pdev, bf->bf_dmacontext,
skb_end_pointer(skb) - skb->head,
PCI_DMA_TODEVICE);
}
skb = ieee80211_beacon_get(sc->hw, avp->av_if_data);
bf->bf_mpdu = skb;
if (skb == NULL)
return NULL;
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->seq_no += 0x10;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(sc->seq_no);
}
bf->bf_buf_addr = bf->bf_dmacontext =
pci_map_single(sc->pdev, skb->data,
skb_end_pointer(skb) - skb->head,
PCI_DMA_TODEVICE);
skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
/*
* 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);
if (skb && 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.
*/
while (skb) {
ath_tx_cabq(sc, skb);
skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
}
return bf;
}