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ath9k_htc: Handle TX queue overflow

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Stop/restart TX queues when the internal SKB
queue is full. This helps handle TX better
under heavy load.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith 2010-03-29 16:07:17 +05:30 committed by John W. Linville
parent 6335ed0ff8
commit 7757dfed58
4 changed files with 36 additions and 3 deletions
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3
drivers/net/wireless/ath/ath9k/htc.h
View File

@ -349,6 +349,9 @@ struct ath9k_htc_priv {
struct sk_buff *beacon;
spinlock_t beacon_lock;
bool tx_queues_stop;
spinlock_t tx_lock;
struct ieee80211_vif *vif;
unsigned int rxfilter;
struct tasklet_struct wmi_tasklet;

1
drivers/net/wireless/ath/ath9k/htc_drv_init.c
View File

@ -449,6 +449,7 @@ static int ath9k_init_priv(struct ath9k_htc_priv *priv, u16 devid)
spin_lock_init(&priv->wmi->wmi_lock);
spin_lock_init(&priv->beacon_lock);
spin_lock_init(&priv->tx_lock);
mutex_init(&priv->mutex);
mutex_init(&priv->aggr_work.mutex);
tasklet_init(&priv->wmi_tasklet, ath9k_wmi_tasklet,

23
drivers/net/wireless/ath/ath9k/htc_drv_main.c
View File

@ -994,7 +994,7 @@ static int ath9k_htc_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr;
struct ath9k_htc_priv *priv = hw->priv;
int padpos, padsize;
int padpos, padsize, ret;
hdr = (struct ieee80211_hdr *) skb->data;
@ -1008,8 +1008,19 @@ static int ath9k_htc_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
memmove(skb->data, skb->data + padsize, padpos);
}
if (ath9k_htc_tx_start(priv, skb) != 0) {
ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT, "Tx failed");
ret = ath9k_htc_tx_start(priv, skb);
if (ret != 0) {
if (ret == -ENOMEM) {
ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
"Stopping TX queues\n");
ieee80211_stop_queues(hw);
spin_lock_bh(&priv->tx_lock);
priv->tx_queues_stop = true;
spin_unlock_bh(&priv->tx_lock);
} else {
ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
"Tx failed");
}
goto fail_tx;
}
@ -1074,6 +1085,12 @@ static int ath9k_htc_start(struct ieee80211_hw *hw)
priv->op_flags &= ~OP_INVALID;
htc_start(priv->htc);
spin_lock_bh(&priv->tx_lock);
priv->tx_queues_stop = false;
spin_unlock_bh(&priv->tx_lock);
ieee80211_wake_queues(hw);
mutex_unlock:
mutex_unlock(&priv->mutex);
return ret;

12
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
View File

@ -226,6 +226,18 @@ void ath9k_tx_tasklet(unsigned long data)
/* Send status to mac80211 */
ieee80211_tx_status(priv->hw, skb);
}
/* Wake TX queues if needed */
spin_lock_bh(&priv->tx_lock);
if (priv->tx_queues_stop) {
priv->tx_queues_stop = false;
spin_unlock_bh(&priv->tx_lock);
ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
"Waking up TX queues\n");
ieee80211_wake_queues(priv->hw);
return;
}
spin_unlock_bh(&priv->tx_lock);
}
void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,