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ath9k: Fix beacon setup

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This patch revamps interface addition and deletion and simplifies
slot allocation. There is no need to setup the beacon buffer
in add/remove interface, remove this and use simple APIs for
assigning/deleting slots.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan
2012-07-17 17:15:30 +05:30
committed by John W. Linville
parent 0f245ed20b
commit 130ef6e9dc
3 changed files with 50 additions and 149 deletions
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147
drivers/net/wireless/ath/ath9k/beacon.c
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@@ -222,51 +222,43 @@ static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
return bf;
}
int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
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;
struct ath_buf *bf;
struct sk_buff *skb;
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
__le64 tstamp;
struct ath_vif *avp = (void *)vif->drv_priv;
int slot;
avp = (void *)vif->drv_priv;
avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
list_del(&avp->av_bcbuf->list);
/* 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 (ath9k_uses_beacons(vif->type)) {
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) {
avp->av_bslot = slot;
avp->is_bslot_active = false;
/* NB: keep looking for a double slot */
if (slot == 0 || !sc->beacon.bslot[slot-1])
break;
}
BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
sc->beacon.bslot[avp->av_bslot] = vif;
sc->nbcnvifs++;
for (slot = 0; slot < ATH_BCBUF; slot++) {
if (sc->beacon.bslot[slot] == NULL) {
avp->av_bslot = slot;
avp->is_bslot_active = false;
break;
}
}
/* release the previous beacon frame, if it already exists. */
bf = avp->av_bcbuf;
if (bf->bf_mpdu != NULL) {
skb = bf->bf_mpdu;
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);
@@ -274,80 +266,13 @@ int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
bf->bf_buf_addr = 0;
}
/* NB: the beacon data buffer must be 32-bit aligned. */
skb = ieee80211_beacon_get(sc->hw, vif);
if (skb == NULL)
return -ENOMEM;
avp->av_bcbuf = NULL;
avp->is_bslot_active = false;
sc->beacon.bslot[avp->av_bslot] = NULL;
sc->nbcnvifs--;
list_add_tail(&bf->list, &sc->beacon.bbuf);
tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
/* Calculate a TSF adjustment factor required for staggered beacons. */
if (avp->av_bslot > 0) {
u64 tsfadjust;
int intval;
intval = cur_conf->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 = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(tsfadjust);
ath_dbg(common, 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 = 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 beacon alloc\n");
return -ENOMEM;
}
avp->is_bslot_active = true;
return 0;
}
void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
{
if (avp->av_bcbuf != NULL) {
struct ath_buf *bf;
avp->is_bslot_active = false;
if (avp->av_bslot != -1) {
sc->beacon.bslot[avp->av_bslot] = NULL;
sc->nbcnvifs--;
avp->av_bslot = -1;
}
bf = avp->av_bcbuf;
if (bf->bf_mpdu != NULL) {
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;
}
list_add_tail(&bf->list, &sc->beacon.bbuf);
avp->av_bcbuf = NULL;
}
tasklet_enable(&sc->bcon_tasklet);
}
void ath_beacon_tasklet(unsigned long data)