[PATCH 2/2] r8169: irq debug stuff.

[Francois Romieu]

Signed-off-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
---
 drivers/net/ethernet/realtek/r8169.c |   59 ++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index abb028a..4a05b68 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -782,6 +782,15 @@ struct rtl8169_private {
 
 #ifdef CONFIG_R8169_DEBUGFS
 	struct dentry *debugfs;
+
+#define RTL_DEBUG_EVENT_RING_SIZE	1024
+	struct rtl_event_ring {
+		struct rtl_event {
+			u16 ts;
+			u16 evt;
+		} evts[RTL_DEBUG_EVENT_RING_SIZE];
+		int used;
+	} event_ring;
 #endif
 };
 
@@ -5849,6 +5858,31 @@ process_pkt:
 	return count;
 }
 
+#ifdef CONFIG_R8169_DEBUGFS
+static void rtl_trace_event(struct rtl8169_private *tp, u16 status)
+{
+	struct rtl_event_ring *evr = &tp->event_ring;
+	int used = evr->used;
+	struct rtl_event *e = evr->evts + used;
+
+	if (used >= RTL_DEBUG_EVENT_RING_SIZE) {
+		if (net_ratelimit())
+			netif_err(tp, drv, tp->dev, "event ring full.\n");
+		return;
+	}
+
+	/* ms. Well, almost. */
+	e->ts = ((local_clock() / 100000) % 100000) >> 1;
+	e->evt = status;
+	evr->used = used + 1;
+}
+
+#else /* !CONFIG_R8169_DEBUGFS */
+
+#define rtl_trace_event(tp, status)	do { } while (0)
+
+#endif /* !CONFIG_R8169_DEBUGFS */
+
 static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 {
 	struct net_device *dev = dev_instance;
@@ -5858,6 +5892,8 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 
 	status = rtl_get_events(tp);
 	if (status && status != 0xffff) {
+		rtl_trace_event(tp, status);
+
 		status &= RTL_EVENT_NAPI | tp->event_slow;
 		if (status) {
 			handled = 1;
@@ -6776,6 +6812,28 @@ static int rtl_debug_open_tx(struct inode *inode, struct file *file)
 
 DECLARE_RTL_DEBUG_FOPS(tx);
 
+static int rtl_debug_show_irq(struct seq_file *seq, void *v)
+{
+	struct rtl8169_private *tp = seq->private;
+	struct rtl_event_ring *evr = &tp->event_ring;
+	int i;
+
+	for (i = 0; i < min(evr->used, RTL_DEBUG_EVENT_RING_SIZE); i++) {
+		struct rtl_event *e = evr->evts + i;
+
+		seq_printf(seq, "[%05d] %04x\n", e->ts << 1, e->evt);
+	}
+
+	return 0;
+}
+
+static int rtl_debug_open_irq(struct inode *inode, struct file *file)
+{
+	return single_open(file, rtl_debug_show_irq, inode->i_private);
+}
+
+DECLARE_RTL_DEBUG_FOPS(irq);
+
 static void rtl_debug_create_tree(struct net_device *dev)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
@@ -6786,6 +6844,7 @@ static void rtl_debug_create_tree(struct net_device *dev)
 	} ent[] = {
 		{ &rtl_debug_fops_rx,	"rx" },
 		{ &rtl_debug_fops_tx,	"tx" },
+		{ &rtl_debug_fops_irq,	"irq" },
 		{ NULL, }
 	};
 	int i;
-- 
1.7.10.2


--x+6KMIRAuhnl3hBn--
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