wil6210: interrupt statistics

Track number of interrupts and Tx/Rx packets;
expose through debugfs 'info'. Reset upon read.
Used to analyse effectivness of interrupt coalescing and NAPI.
Read twice with some interval like
cat info > /dev/null; sleep 1; cat 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

@@ -851,10 +851,21 @@ static const struct file_operations fops_link = {
 /*---------info------------*/
 static int wil_info_debugfs_show(struct seq_file *s, void *data)
 {
+	struct wil6210_priv *wil = s->private;
+	struct net_device *ndev = wil_to_ndev(wil);
 	int is_ac = power_supply_is_system_supplied();
+	int rx = atomic_xchg(&wil->isr_count_rx, 0);
+	int tx = atomic_xchg(&wil->isr_count_tx, 0);
+	static ulong rxf_old, txf_old;
+	ulong rxf = ndev->stats.rx_packets;
+	ulong txf = ndev->stats.tx_packets;
 
 	/* >0 : AC; 0 : battery; <0 : error */
 	seq_printf(s, "AC powered : %d\n", is_ac);
+	seq_printf(s, "Rx irqs:packets : %8d : %8ld\n", rx, rxf - rxf_old);
+	seq_printf(s, "Tx irqs:packets : %8d : %8ld\n", tx, txf - txf_old);
+	rxf_old = rxf;
+	txf_old = txf;
 
 	return 0;
 }

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

@@ -208,6 +208,7 @@ static irqreturn_t wil6210_irq_rx(int irq, void *cookie)
 
 	/* Rx IRQ will be enabled when NAPI processing finished */
 
+	atomic_inc(&wil->isr_count_rx);
 	return IRQ_HANDLED;
 }
 
@@ -246,6 +247,7 @@ static irqreturn_t wil6210_irq_tx(int irq, void *cookie)
 
 	/* Tx IRQ will be enabled when NAPI processing finished */
 
+	atomic_inc(&wil->isr_count_tx);
 	return IRQ_HANDLED;
 }
 

drivers/net/wireless/ath/wil6210/wil6210.h

@@ -412,6 +412,7 @@ struct wil6210_priv {
 	struct mutex mutex; /* for wil6210_priv access in wil_{up|down} */
 	/* statistics */
 	struct wil6210_stats stats;
+	atomic_t isr_count_rx, isr_count_tx;
 	/* debugfs */
 	struct dentry *debug;
 	struct debugfs_blob_wrapper fw_code_blob;