bnxt_en: Use macros to define port statistics size and offset.

The port statistics structures have hard coded padding and offset.
Define macros to make this look cleaner.
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -3788,8 +3788,7 @@ static int bnxt_alloc_stats(struct bnxt *bp)
 	if (bp->hw_rx_port_stats)
 		goto alloc_ext_stats;
 
-	bp->hw_port_stats_size = sizeof(struct rx_port_stats) +
-				 sizeof(struct tx_port_stats) + 1024;
+	bp->hw_port_stats_size = BNXT_PORT_STATS_SIZE;
 
 	bp->hw_rx_port_stats =
 		dma_alloc_coherent(&pdev->dev, bp->hw_port_stats_size,
@@ -3798,9 +3797,10 @@ static int bnxt_alloc_stats(struct bnxt *bp)
 	if (!bp->hw_rx_port_stats)
 		return -ENOMEM;
 
-	bp->hw_tx_port_stats = (void *)(bp->hw_rx_port_stats + 1) + 512;
+	bp->hw_tx_port_stats = (void *)bp->hw_rx_port_stats +
+			       BNXT_TX_PORT_STATS_BYTE_OFFSET;
 	bp->hw_tx_port_stats_map = bp->hw_rx_port_stats_map +
-				   sizeof(struct rx_port_stats) + 512;
+				   BNXT_TX_PORT_STATS_BYTE_OFFSET;
 	bp->flags |= BNXT_FLAG_PORT_STATS;
 
 alloc_ext_stats:

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1926,12 +1926,18 @@ struct bnxt {
 	struct device		*hwmon_dev;
 };
 
+#define BNXT_PORT_STATS_SIZE				\
+	(sizeof(struct rx_port_stats) + sizeof(struct tx_port_stats) + 1024)
+
+#define BNXT_TX_PORT_STATS_BYTE_OFFSET			\
+	(sizeof(struct rx_port_stats) + 512)
+
 #define BNXT_RX_STATS_OFFSET(counter)			\
 	(offsetof(struct rx_port_stats, counter) / 8)
 
 #define BNXT_TX_STATS_OFFSET(counter)			\
 	((offsetof(struct tx_port_stats, counter) +	\
-	  sizeof(struct rx_port_stats) + 512) / 8)
+	  BNXT_TX_PORT_STATS_BYTE_OFFSET) / 8)
 
 #define BNXT_RX_STATS_EXT_OFFSET(counter)		\
 	(offsetof(struct rx_port_stats_ext, counter) / 8)