From: Sujith Manoharan <Sujith.Manoharan@xxxxxxxxxxx>
When doing a channel set or a reset operation the pending
frames queued up for transmission have to be flushed and
sent to mac80211. Fixing this has to be done in two separate
steps:
* Flush queued frames and kill the URB TX completion handler.
* Complete all the frames that in the TX pending queue.
This patch adds proper support for draining and all the callsites
namely, channel change/reset/idle/stop are fixed. A separate queue
is used for handling failed frames.
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@xxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/hif_usb.c | 55 +++++++++---------------
drivers/net/wireless/ath/ath9k/htc.h | 6 ++-
drivers/net/wireless/ath/ath9k/htc_drv_debug.c | 8 ++--
drivers/net/wireless/ath/ath9k/htc_drv_gpio.c | 3 +-
drivers/net/wireless/ath/ath9k/htc_drv_main.c | 15 ++++---
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 31 +++++++++++++-
6 files changed, 69 insertions(+), 49 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index a8134f8..47fdd19 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -133,7 +133,19 @@ static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
while ((skb = __skb_dequeue(list)) != NULL) {
dev_kfree_skb_any(skb);
- TX_STAT_INC(skb_dropped);
+ }
+}
+
+static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
+ struct sk_buff_head *queue,
+ bool txok)
+{
+ struct sk_buff *skb;
+
+ while ((skb = __skb_dequeue(queue)) != NULL) {
+ ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
+ skb, txok);
+ (txok) ? TX_STAT_INC(skb_success) : TX_STAT_INC(skb_failed);
}
}
@@ -141,7 +153,7 @@ static void hif_usb_tx_cb(struct urb *urb)
{
struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
struct hif_device_usb *hif_dev;
- struct sk_buff *skb;
+ bool txok = true;
if (!tx_buf || !tx_buf->hif_dev)
return;
@@ -155,10 +167,7 @@ static void hif_usb_tx_cb(struct urb *urb)
case -ECONNRESET:
case -ENODEV:
case -ESHUTDOWN:
- /*
- * The URB has been killed, free the SKBs.
- */
- ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
+ txok = false;
/*
* If the URBs are being flushed, no need to add this
@@ -167,41 +176,19 @@ static void hif_usb_tx_cb(struct urb *urb)
spin_lock(&hif_dev->tx.tx_lock);
if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
spin_unlock(&hif_dev->tx.tx_lock);
+ ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
return;
}
spin_unlock(&hif_dev->tx.tx_lock);
- /*
- * In the stop() case, this URB has to be added to
- * the free list.
- */
- goto add_free;
+ break;
default:
+ txok = false;
break;
}
- /*
- * Check if TX has been stopped, this is needed because
- * this CB could have been invoked just after the TX lock
- * was released in hif_stop() and kill_urb() hasn't been
- * called yet.
- */
- spin_lock(&hif_dev->tx.tx_lock);
- if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
- spin_unlock(&hif_dev->tx.tx_lock);
- ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
- goto add_free;
- }
- spin_unlock(&hif_dev->tx.tx_lock);
-
- /* Complete the queued SKBs. */
- while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
- ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
- skb, 1);
- TX_STAT_INC(skb_completed);
- }
+ ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
-add_free:
/* Re-initialize the SKB queue */
tx_buf->len = tx_buf->offset = 0;
__skb_queue_head_init(&tx_buf->skb_queue);
@@ -274,7 +261,7 @@ static int __hif_usb_tx(struct hif_device_usb *hif_dev)
ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
if (ret) {
tx_buf->len = tx_buf->offset = 0;
- ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
+ ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
__skb_queue_head_init(&tx_buf->skb_queue);
list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
hif_dev->tx.tx_buf_cnt++;
@@ -344,7 +331,7 @@ static void hif_usb_stop(void *hif_handle, u8 pipe_id)
unsigned long flags;
spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
- ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
+ ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
hif_dev->tx.tx_skb_cnt = 0;
hif_dev->tx.flags |= HIF_USB_TX_STOP;
spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index 332175e..fc8730e 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -268,6 +268,7 @@ struct ath9k_htc_tx {
u8 flags;
int queued_cnt;
struct sk_buff_head tx_queue;
+ struct sk_buff_head tx_failed;
DECLARE_BITMAP(tx_slot, MAX_TX_BUF_NUM);
spinlock_t tx_lock;
};
@@ -302,8 +303,8 @@ struct ath_tx_stats {
u32 buf_queued;
u32 buf_completed;
u32 skb_queued;
- u32 skb_completed;
- u32 skb_dropped;
+ u32 skb_success;
+ u32 skb_failed;
u32 cab_queued;
u32 queue_stats[WME_NUM_AC];
};
@@ -538,6 +539,7 @@ void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv);
void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv);
int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv);
void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot);
+void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv);
int ath9k_rx_init(struct ath9k_htc_priv *priv);
void ath9k_rx_cleanup(struct ath9k_htc_priv *priv);
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
index 6fc6cb7..91a486c 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
@@ -88,11 +88,11 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
"%20s : %10u\n", "SKBs queued",
priv->debug.tx_stats.skb_queued);
len += snprintf(buf + len, sizeof(buf) - len,
- "%20s : %10u\n", "SKBs completed",
- priv->debug.tx_stats.skb_completed);
+ "%20s : %10u\n", "SKBs success",
+ priv->debug.tx_stats.skb_success);
len += snprintf(buf + len, sizeof(buf) - len,
- "%20s : %10u\n", "SKBs dropped",
- priv->debug.tx_stats.skb_dropped);
+ "%20s : %10u\n", "SKBs failed",
+ priv->debug.tx_stats.skb_failed);
len += snprintf(buf + len, sizeof(buf) - len,
"%20s : %10u\n", "CAB queued",
priv->debug.tx_stats.cab_queued);
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_gpio.c b/drivers/net/wireless/ath/ath9k/htc_drv_gpio.c
index 92e4b31..dc0b33d 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_gpio.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_gpio.c
@@ -429,9 +429,8 @@ void ath9k_htc_radio_disable(struct ieee80211_hw *hw)
/* Stop TX */
ieee80211_stop_queues(hw);
- htc_stop(priv->htc);
+ ath9k_htc_tx_drain(priv);
WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
- skb_queue_purge(&priv->tx.tx_queue);
/* Stop RX */
WMI_CMD(WMI_STOP_RECV_CMDID);
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index c7e056b..fb9ff11 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -193,7 +193,9 @@ void ath9k_htc_reset(struct ath9k_htc_priv *priv)
ath9k_htc_stop_ani(priv);
ieee80211_stop_queues(priv->hw);
- htc_stop(priv->htc);
+
+ ath9k_htc_tx_drain(priv);
+
WMI_CMD(WMI_DISABLE_INTR_CMDID);
WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
WMI_CMD(WMI_STOP_RECV_CMDID);
@@ -248,7 +250,9 @@ static int ath9k_htc_set_channel(struct ath9k_htc_priv *priv,
fastcc = !!(hw->conf.flags & IEEE80211_CONF_OFFCHANNEL);
ath9k_htc_ps_wakeup(priv);
- htc_stop(priv->htc);
+
+ ath9k_htc_tx_drain(priv);
+
WMI_CMD(WMI_DISABLE_INTR_CMDID);
WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
WMI_CMD(WMI_STOP_RECV_CMDID);
@@ -263,6 +267,7 @@ static int ath9k_htc_set_channel(struct ath9k_htc_priv *priv,
if (!fastcc)
caldata = &priv->caldata;
+
ret = ath9k_hw_reset(ah, hchan, caldata, fastcc);
if (ret) {
ath_err(common,
@@ -960,16 +965,14 @@ static void ath9k_htc_stop(struct ieee80211_hw *hw)
}
ath9k_htc_ps_wakeup(priv);
- htc_stop(priv->htc);
+
WMI_CMD(WMI_DISABLE_INTR_CMDID);
WMI_CMD(WMI_DRAIN_TXQ_ALL_CMDID);
WMI_CMD(WMI_STOP_RECV_CMDID);
tasklet_kill(&priv->rx_tasklet);
- tasklet_kill(&priv->tx_tasklet);
-
- skb_queue_purge(&priv->tx.tx_queue);
+ ath9k_htc_tx_drain(priv);
ath9k_wmi_event_drain(priv);
mutex_unlock(&priv->mutex);
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
index 944440c..9e0c34b 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -423,6 +423,26 @@ send_mac80211:
ieee80211_tx_status(priv->hw, skb);
}
+void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
+{
+ struct sk_buff *skb = NULL;
+
+ /*
+ * Ensure that all pending TX frames are flushed,
+ * and that the TX completion tasklet is killed.
+ */
+ htc_stop(priv->htc);
+ tasklet_kill(&priv->tx_tasklet);
+
+ while ((skb = skb_dequeue(&priv->tx.tx_queue)) != NULL) {
+ ath9k_htc_tx_process(priv, skb);
+ }
+
+ while ((skb = skb_dequeue(&priv->tx.tx_failed)) != NULL) {
+ ath9k_htc_tx_process(priv, skb);
+ }
+}
+
void ath9k_tx_tasklet(unsigned long data)
{
struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
@@ -432,6 +452,10 @@ void ath9k_tx_tasklet(unsigned long data)
ath9k_htc_tx_process(priv, skb);
}
+ while ((skb = skb_dequeue(&priv->tx.tx_failed)) != NULL) {
+ ath9k_htc_tx_process(priv, skb);
+ }
+
/* Wake TX queues if needed */
ath9k_htc_check_wake_queues(priv);
}
@@ -445,13 +469,18 @@ void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
tx_ctl = HTC_SKB_CB(skb);
tx_ctl->txok = txok;
- skb_queue_tail(&priv->tx.tx_queue, skb);
+ if (txok)
+ skb_queue_tail(&priv->tx.tx_queue, skb);
+ else
+ skb_queue_tail(&priv->tx.tx_failed, skb);
+
tasklet_schedule(&priv->tx_tasklet);
}
int ath9k_tx_init(struct ath9k_htc_priv *priv)
{
skb_queue_head_init(&priv->tx.tx_queue);
+ skb_queue_head_init(&priv->tx.tx_failed);
return 0;
}
--
1.7.4.1
--
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