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mac80211: unify TIM bit handling

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Currently, the TIM bit for a given station is set
and cleared all over the place. Since the logic to
set/clear it will become much more complex when we
add uAPSD support, as a first step let's collect
the entire logic in one place. This requires a few
small adjustments to other places.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2011-09-29 16:04:27 +02:00
committed by John W. Linville
parent 042ec45337
commit c868cb35d0
4 changed files with 51 additions and 69 deletions
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101
net/mac80211/sta_info.c
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@@ -641,54 +641,42 @@ static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
bss->tim[aid / 8] &= ~(1 << (aid % 8));
}
static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
BUG_ON(!bss);
__bss_tim_set(bss, sta->sta.aid);
if (sta->local->ops->set_tim) {
sta->local->tim_in_locked_section = true;
drv_set_tim(sta->local, &sta->sta, true);
sta->local->tim_in_locked_section = false;
}
}
void sta_info_set_tim_bit(struct sta_info *sta)
void sta_info_recalc_tim(struct sta_info *sta)
{
struct ieee80211_local *local = sta->local;
struct ieee80211_if_ap *bss = sta->sdata->bss;
unsigned long flags;
bool have_data = false;
BUG_ON(!sta->sdata->bss);
if (WARN_ON_ONCE(!sta->sdata->bss))
return;
spin_lock_irqsave(&sta->local->sta_lock, flags);
__sta_info_set_tim_bit(sta->sdata->bss, sta);
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
}
/* No need to do anything if the driver does all */
if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
return;
static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
BUG_ON(!bss);
if (sta->dead)
goto done;
__bss_tim_clear(bss, sta->sta.aid);
have_data = test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF) ||
!skb_queue_empty(&sta->tx_filtered) ||
!skb_queue_empty(&sta->ps_tx_buf);
if (sta->local->ops->set_tim) {
sta->local->tim_in_locked_section = true;
drv_set_tim(sta->local, &sta->sta, false);
sta->local->tim_in_locked_section = false;
done:
spin_lock_irqsave(&local->sta_lock, flags);
if (have_data)
__bss_tim_set(bss, sta->sta.aid);
else
__bss_tim_clear(bss, sta->sta.aid);
if (local->ops->set_tim) {
local->tim_in_locked_section = true;
drv_set_tim(local, &sta->sta, have_data);
local->tim_in_locked_section = false;
}
}
void sta_info_clear_tim_bit(struct sta_info *sta)
{
unsigned long flags;
BUG_ON(!sta->sdata->bss);
spin_lock_irqsave(&sta->local->sta_lock, flags);
__sta_info_clear_tim_bit(sta->sdata->bss, sta);
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
spin_unlock_irqrestore(&local->sta_lock, flags);
}
static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
@@ -717,6 +705,10 @@ static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
unsigned long flags;
struct sk_buff *skb;
/* This is only necessary for stations on BSS interfaces */
if (!sta->sdata->bss)
return false;
for (;;) {
spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
skb = skb_peek(&sta->ps_tx_buf);
@@ -736,9 +728,9 @@ static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
#endif
dev_kfree_skb(skb);
if (skb_queue_empty(&sta->ps_tx_buf) &&
!test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
sta_info_clear_tim_bit(sta);
/* if the queue is now empty recalc TIM bit */
if (skb_queue_empty(&sta->ps_tx_buf))
sta_info_recalc_tim(sta);
}
return !skb_queue_empty(&sta->ps_tx_buf);
@@ -748,7 +740,6 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
{
struct ieee80211_local *local;
struct ieee80211_sub_if_data *sdata;
struct sk_buff *skb;
unsigned long flags;
int ret, i;
@@ -792,7 +783,7 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
BUG_ON(!sdata->bss);
atomic_dec(&sdata->bss->num_sta_ps);
sta_info_clear_tim_bit(sta);
sta_info_recalc_tim(sta);
}
local->num_sta--;
@@ -818,6 +809,10 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
*/
synchronize_rcu();
local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf);
__skb_queue_purge(&sta->ps_tx_buf);
__skb_queue_purge(&sta->tx_filtered);
#ifdef CONFIG_MAC80211_MESH
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_accept_plinks_update(sdata);
@@ -840,14 +835,6 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
}
#endif
while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
local->total_ps_buffered--;
dev_kfree_skb_any(skb);
}
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
dev_kfree_skb_any(skb);
__sta_info_free(local, sta);
return 0;
@@ -1027,9 +1014,6 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
if (!skb_queue_empty(&sta->ps_tx_buf))
sta_info_clear_tim_bit(sta);
/* Send all buffered frames to the station */
sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
@@ -1037,6 +1021,8 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
sent += buffered;
local->total_ps_buffered -= buffered;
sta_info_recalc_tim(sta);
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
"since STA not sleeping anymore\n", sdata->name,
@@ -1086,8 +1072,7 @@ void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
ieee80211_add_pending_skb(local, skb);
if (no_pending_pkts)
sta_info_clear_tim_bit(sta);
sta_info_recalc_tim(sta);
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
} else {
/*
@@ -1126,6 +1111,6 @@ void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
return;
set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
sta_info_set_tim_bit(sta);
sta_info_recalc_tim(sta);
}
EXPORT_SYMBOL(ieee80211_sta_set_buffered);