skge: add a debug interface

Add a debugfs interface to look at internal ring state.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/skge.h b/drivers/net/skge.h
index 5175424..17caccb 100644
--- a/drivers/net/skge.h
+++ b/drivers/net/skge.h
@@ -2469,6 +2469,9 @@
 	void		     *mem;	/* PCI memory for rings */
 	dma_addr_t	     dma;
 	unsigned long	     mem_size;
+#ifdef CONFIG_SKGE_DEBUG
+	struct dentry	     *debugfs;
+#endif
 };