[BNX2]: Add ring constants.

Define the various ring constants to make the code cleaner.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 30ba366..e6a2153 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6408,6 +6408,11 @@
 	DECLARE_PCI_UNMAP_ADDR(mapping)
 };
 
+#define SW_RXBD_RING_SIZE (sizeof(struct sw_bd) * RX_DESC_CNT)
+#define RXBD_RING_SIZE (sizeof(struct rx_bd) * RX_DESC_CNT)
+#define SW_TXBD_RING_SIZE (sizeof(struct sw_bd) * TX_DESC_CNT)
+#define TXBD_RING_SIZE (sizeof(struct tx_bd) * TX_DESC_CNT)
+
 /* Buffered flash (Atmel: AT45DB011B) specific information */
 #define SEEPROM_PAGE_BITS			2
 #define SEEPROM_PHY_PAGE_SIZE			(1 << SEEPROM_PAGE_BITS)