ath9k_htc: Add dropped SKB count to debugfs

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 13 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index fe994e22989..3091bb3cef9 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -129,6 +129,7 @@ static void hif_usb_tx_cb(struct urb *urb)
                                 TX_STAT_INC(skb_completed);
                         } else {
                                 dev_kfree_skb_any(skb);
+                                TX_STAT_INC(skb_dropped);
                         }
                 }
 
@@ -149,11 +150,15 @@ static void hif_usb_tx_cb(struct urb *urb)
         }
 }
 
-static inline void ath9k_skb_queue_purge(struct sk_buff_head *list)
+static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
+                                         struct sk_buff_head *list)
 {
         struct sk_buff *skb;
-        while ((skb = __skb_dequeue(list)) != NULL)
+
+        while ((skb = __skb_dequeue(list)) != NULL) {
                 dev_kfree_skb_any(skb);
+                TX_STAT_INC(skb_dropped);
+        }
 }
 
 /* TX lock has to be taken */
@@ -214,7 +219,7 @@ 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(&tx_buf->skb_queue);
+                ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
                 __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++;
@@ -281,7 +286,7 @@ 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->tx.tx_skb_queue);
+        ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
         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 78213fc71b0..6a4614a8701 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -261,6 +261,7 @@ struct ath_tx_stats {
         u32 buf_completed;
         u32 skb_queued;
         u32 skb_completed;
+        u32 skb_dropped;
 };
 
 struct ath_rx_stats {
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index 2cea577f884..081f4450428 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -609,6 +609,9 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
         len += snprintf(buf + len, sizeof(buf) - len,
                         "%20s : %10u\n", "SKBs completed",
                         priv->debug.tx_stats.skb_completed);
+        len += snprintf(buf + len, sizeof(buf) - len,
+                        "%20s : %10u\n", "SKBs dropped",
+                        priv->debug.tx_stats.skb_dropped);
 
         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
 }