diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index f472a6dbbe6f..432c6a818ae5 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -90,11 +90,11 @@ extern const char gfar_driver_version[];
 #define DEFAULT_RX_LFC_THR  16
 #define DEFAULT_LFC_PTVVAL  4
 
-/* prevent fragmenation by HW in DSA environments */
-#define GFAR_RXB_SIZE roundup(1536 + 8, 64)
-#define GFAR_SKBFRAG_SIZE (RXBUF_ALIGNMENT + GFAR_RXB_SIZE \
-			  + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 #define GFAR_RXB_TRUESIZE 2048
+#define GFAR_SKBFRAG_OVR (RXBUF_ALIGNMENT \
+			  + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+#define GFAR_RXB_SIZE rounddown(GFAR_RXB_TRUESIZE - GFAR_SKBFRAG_OVR, 64)
+#define GFAR_SKBFRAG_SIZE (GFAR_RXB_SIZE + GFAR_SKBFRAG_OVR)
 
 #define TX_RING_MOD_MASK(size) (size-1)
 #define RX_RING_MOD_MASK(size) (size-1)