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mac80211: consolidate TIM handling code 

This consolidates all TIM handling code to avoid re-introducing
errors with the bitmap/set_tim order and to reduce code. While
reading the code I noticed a possible problem so I also added
a comment about that.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-02-20 11:21:35 +01:00 committed by John W. Linville
parent 836341a704
commit 004c872e78
5 changed files with 84 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
net/mac80211/ieee80211_i.h
View File

@ -207,7 +207,7 @@ struct ieee80211_if_ap {
/* yes, this looks ugly, but guarantees that we can later use
* bitmap_empty :)
* NB: don't ever use set_bit, use bss_tim_set/bss_tim_clear! */
* NB: don't touch this bitmap, use sta_info_{set,clear}_tim_bit */
u8 tim[sizeof(unsigned long) * BITS_TO_LONGS(IEEE80211_MAX_AID + 1)];
atomic_t num_sta_ps; /* number of stations in PS mode */
struct sk_buff_head ps_bc_buf;
@ -640,40 +640,6 @@ struct sta_attribute {
ssize_t (*store)(struct sta_info *, const char *buf, size_t count);
};
static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
{
/*
* This format has been mandated by the IEEE specifications,
* so this line may not be changed to use the __set_bit() format.
*/
bss->tim[aid / 8] |= (1 << (aid % 8));
}
static inline void bss_tim_set(struct ieee80211_local *local,
struct ieee80211_if_ap *bss, u16 aid)
{
read_lock_bh(&local->sta_lock);
__bss_tim_set(bss, aid);
read_unlock_bh(&local->sta_lock);
}
static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
{
/*
* This format has been mandated by the IEEE specifications,
* so this line may not be changed to use the __clear_bit() format.
*/
bss->tim[aid / 8] &= ~(1 << (aid % 8));
}
static inline void bss_tim_clear(struct ieee80211_local *local,
struct ieee80211_if_ap *bss, u16 aid)
{
read_lock_bh(&local->sta_lock);
__bss_tim_clear(bss, aid);
read_unlock_bh(&local->sta_lock);
}
static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
{
return compare_ether_addr(raddr, addr) == 0 ||

29
net/mac80211/rx.c
View File

@ -596,19 +596,20 @@ static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
DECLARE_MAC_BUF(mac);
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
if (sdata->bss)
atomic_dec(&sdata->bss->num_sta_ps);
sta->flags &= ~(WLAN_STA_PS | WLAN_STA_PSPOLL);
if (!skb_queue_empty(&sta->ps_tx_buf)) {
if (sdata->bss)
bss_tim_clear(local, sdata->bss, sta->aid);
if (local->ops->set_tim)
local->ops->set_tim(local_to_hw(local), sta->aid, 0);
}
if (!skb_queue_empty(&sta->ps_tx_buf))
sta_info_clear_tim_bit(sta);
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
printk(KERN_DEBUG "%s: STA %s aid %d exits power save mode\n",
dev->name, print_mac(mac, sta->addr), sta->aid);
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
/* Send all buffered frames to the station */
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
@ -945,20 +946,20 @@ ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
dev_queue_xmit(skb);
if (no_pending_pkts) {
if (rx->sdata->bss)
bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
if (rx->local->ops->set_tim)
rx->local->ops->set_tim(local_to_hw(rx->local),
rx->sta->aid, 0);
}
if (no_pending_pkts)
sta_info_clear_tim_bit(rx->sta);
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
} else if (!rx->u.rx.sent_ps_buffered) {
/*
* FIXME: This can be the result of a race condition between
* us expiring a frame and the station polling for it.
* Should we send it a null-func frame indicating we
* have nothing buffered for it?
*/
printk(KERN_DEBUG "%s: STA %s sent PS Poll even "
"though there is no buffered frames for it\n",
rx->dev->name, print_mac(mac, rx->sta->addr));
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
}
/* Free PS Poll skb here instead of returning RX_DROP that would

87
net/mac80211/sta_info.c
View File

@ -191,6 +191,64 @@ struct sta_info * sta_info_add(struct ieee80211_local *local,
return sta;
}
static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
{
/*
* This format has been mandated by the IEEE specifications,
* so this line may not be changed to use the __set_bit() format.
*/
bss->tim[aid / 8] |= (1 << (aid % 8));
}
static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
{
/*
* This format has been mandated by the IEEE specifications,
* so this line may not be changed to use the __clear_bit() format.
*/
bss->tim[aid / 8] &= ~(1 << (aid % 8));
}
static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
if (bss)
__bss_tim_set(bss, sta->aid);
if (sta->local->ops->set_tim)
sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1);
}
void sta_info_set_tim_bit(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
read_lock_bh(&sta->local->sta_lock);
__sta_info_set_tim_bit(sdata->bss, sta);
read_unlock_bh(&sta->local->sta_lock);
}
static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
if (bss)
__bss_tim_clear(bss, sta->aid);
if (sta->local->ops->set_tim)
sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0);
}
void sta_info_clear_tim_bit(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
read_lock_bh(&sta->local->sta_lock);
__sta_info_clear_tim_bit(sdata->bss, sta);
read_unlock_bh(&sta->local->sta_lock);
}
/* Caller must hold local->sta_lock */
void sta_info_remove(struct sta_info *sta)
{
@ -207,10 +265,9 @@ void sta_info_remove(struct sta_info *sta)
sta->flags &= ~WLAN_STA_PS;
if (sdata->bss)
atomic_dec(&sdata->bss->num_sta_ps);
__sta_info_clear_tim_bit(sdata->bss, sta);
}
local->num_sta--;
sta_info_remove_aid_ptr(sta);
}
void sta_info_free(struct sta_info *sta)
@ -310,13 +367,8 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
"%s)\n", print_mac(mac, sta->addr));
dev_kfree_skb(skb);
if (skb_queue_empty(&sta->ps_tx_buf)) {
if (sdata->bss)
bss_tim_set(sta->local, sdata->bss, sta->aid);
if (sta->local->ops->set_tim)
sta->local->ops->set_tim(local_to_hw(sta->local),
sta->aid, 0);
}
if (skb_queue_empty(&sta->ps_tx_buf))
sta_info_clear_tim_bit(sta);
}
}
@ -395,23 +447,6 @@ void sta_info_stop(struct ieee80211_local *local)
sta_info_flush(local, NULL);
}
void sta_info_remove_aid_ptr(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
if (sta->aid <= 0)
return;
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
if (sdata->bss)
__bss_tim_clear(sdata->bss, sta->aid);
if (sdata->local->ops->set_tim)
sdata->local->ops->set_tim(local_to_hw(sdata->local),
sta->aid, 0);
}
/**
* sta_info_flush - flush matching STA entries from the STA table
* @local: local interface data

4
net/mac80211/sta_info.h
View File

@ -244,7 +244,9 @@ void sta_info_free(struct sta_info *sta);
void sta_info_init(struct ieee80211_local *local);
int sta_info_start(struct ieee80211_local *local);
void sta_info_stop(struct ieee80211_local *local);
void sta_info_remove_aid_ptr(struct sta_info *sta);
void sta_info_flush(struct ieee80211_local *local, struct net_device *dev);
void sta_info_set_tim_bit(struct sta_info *sta);
void sta_info_clear_tim_bit(struct sta_info *sta);
#endif /* STA_INFO_H */

11
net/mac80211/tx.c
View File

@ -416,14 +416,11 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
dev_kfree_skb(old);
} else
tx->local->total_ps_buffered++;
/* Queue frame to be sent after STA sends an PS Poll frame */
if (skb_queue_empty(&sta->ps_tx_buf)) {
if (tx->sdata->bss)
bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
if (tx->local->ops->set_tim)
tx->local->ops->set_tim(local_to_hw(tx->local),
sta->aid, 1);
}
if (skb_queue_empty(&sta->ps_tx_buf))
sta_info_set_tim_bit(sta);
pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
pkt_data->jiffies = jiffies;
skb_queue_tail(&sta->ps_tx_buf, tx->skb);