wil6210: track Tx queue state

Provide both event (netif_tx_[stop|wake]) tracking via printk;
and state via debugfs 'info'

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/debugfs.c

@@ -859,6 +859,7 @@ static int wil_info_debugfs_show(struct seq_file *s, void *data)
 	static ulong rxf_old, txf_old;
 	ulong rxf = ndev->stats.rx_packets;
 	ulong txf = ndev->stats.tx_packets;
+	unsigned int i;
 
 	/* >0 : AC; 0 : battery; <0 : error */
 	seq_printf(s, "AC powered : %d\n", is_ac);
@@ -867,6 +868,21 @@ static int wil_info_debugfs_show(struct seq_file *s, void *data)
 	rxf_old = rxf;
 	txf_old = txf;
 
+
+#define CHECK_QSTATE(x) (state & BIT(__QUEUE_STATE_ ## x)) ? \
+	" " __stringify(x) : ""
+
+	for (i = 0; i < ndev->num_tx_queues; i++) {
+		struct netdev_queue *txq = netdev_get_tx_queue(ndev, i);
+		unsigned long state = txq->state;
+
+		seq_printf(s, "Tx queue[%i] state : 0x%lx%s%s%s\n", i, state,
+			   CHECK_QSTATE(DRV_XOFF),
+			   CHECK_QSTATE(STACK_XOFF),
+			   CHECK_QSTATE(FROZEN)
+			  );
+	}
+#undef CHECK_QSTATE
 	return 0;
 }
 

drivers/net/wireless/ath/wil6210/main.c

@@ -473,6 +473,7 @@ void wil_link_on(struct wil6210_priv *wil)
 	wil_dbg_misc(wil, "%s()\n", __func__);
 
 	netif_carrier_on(ndev);
+	wil_dbg_misc(wil, "netif_tx_wake : link on\n");
 	netif_tx_wake_all_queues(ndev);
 }
 
@@ -483,6 +484,7 @@ void wil_link_off(struct wil6210_priv *wil)
 	wil_dbg_misc(wil, "%s()\n", __func__);
 
 	netif_tx_stop_all_queues(ndev);
+	wil_dbg_misc(wil, "netif_tx_stop : link off\n");
 	netif_carrier_off(ndev);
 }
 

drivers/net/wireless/ath/wil6210/txrx.c

@@ -1038,8 +1038,10 @@ netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	rc = wil_tx_vring(wil, vring, skb);
 
 	/* do we still have enough room in the vring? */
-	if (wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring))
+	if (wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring)) {
 		netif_tx_stop_all_queues(wil_to_ndev(wil));
+		wil_dbg_txrx(wil, "netif_tx_stop : ring full\n");
+	}
 
 	switch (rc) {
 	case 0:
@@ -1153,8 +1155,10 @@ int wil_tx_complete(struct wil6210_priv *wil, int ringid)
 		txdata->last_idle = get_cycles();
 	}
 
-	if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring))
+	if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) {
+		wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n");
 		netif_tx_wake_all_queues(wil_to_ndev(wil));
+	}
 
 	return done;
 }