net: dsa: Add support for reading switch registers with ethtool

Add support for reading switch registers with 'ethtool -d'.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 37856a2..ed3c34b 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -268,6 +268,13 @@
 			      struct ethtool_eeprom *eeprom, u8 *data);
 	int	(*set_eeprom)(struct dsa_switch *ds,
 			      struct ethtool_eeprom *eeprom, u8 *data);
+
+	/*
+	 * Register access.
+	 */
+	int	(*get_regs_len)(struct dsa_switch *ds, int port);
+	void	(*get_regs)(struct dsa_switch *ds, int port,
+			    struct ethtool_regs *regs, void *p);
 };
 
 void register_switch_driver(struct dsa_switch_driver *type);