r8169: improve max jumbo packet size definition

Sync definition of max jumbo packet size with vendor driver and reserve
22 bytes for VLAN ethernet header plus checksum.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -88,10 +88,10 @@
 #define RTL_R16(tp, reg)		readw(tp->mmio_addr + (reg))
 #define RTL_R32(tp, reg)		readl(tp->mmio_addr + (reg))
 
-#define JUMBO_4K	(4*1024 - ETH_HLEN - 2)
-#define JUMBO_6K	(6*1024 - ETH_HLEN - 2)
-#define JUMBO_7K	(7*1024 - ETH_HLEN - 2)
-#define JUMBO_9K	(9*1024 - ETH_HLEN - 2)
+#define JUMBO_4K	(4 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
+#define JUMBO_6K	(6 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
+#define JUMBO_7K	(7 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
+#define JUMBO_9K	(9 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
 
 static const struct {
 	const char *name;