mlx4_en: Fixed MAX_TX_RINGS definition

Defined as sum of default number of TX rings and number of
rings used for priority flow control mode.
Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mlx4/mlx4_en.h

@@ -61,7 +61,6 @@
 
 #define MLX4_EN_PAGE_SHIFT	12
 #define MLX4_EN_PAGE_SIZE	(1 << MLX4_EN_PAGE_SHIFT)
-#define MAX_TX_RINGS		16
 #define MAX_RX_RINGS		16
 #define TXBB_SIZE		64
 #define HEADROOM		(2048 / TXBB_SIZE + 1)
@@ -107,6 +106,7 @@ enum {
 #define MLX4_EN_SMALL_PKT_SIZE		64
 #define MLX4_EN_NUM_TX_RINGS		8
 #define MLX4_EN_NUM_PPP_RINGS		8
+#define MAX_TX_RINGS			(MLX4_EN_NUM_TX_RINGS + MLX4_EN_NUM_PPP_RINGS)
 #define MLX4_EN_DEF_TX_RING_SIZE	512
 #define MLX4_EN_DEF_RX_RING_SIZE  	1024