tg3: Move general int members to a per-int struct

This patch moves the last_tag, last_tag_irq, and hw_status device
members to a per-interrupt structure.  It also adds a new interrupt
mailbox member (int_mbox) and converts the code to use it rather than a
direct preprocessor constant.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.h

@@ -2492,6 +2492,13 @@ struct tg3_rx_prodring_set {
 struct tg3_napi {
 	struct napi_struct		napi	____cacheline_aligned;
 	struct tg3			*tp;
+	struct tg3_hw_status		*hw_status;
+
+	u32				last_tag;
+	u32				last_irq_tag;
+	u32				int_mbox;
+
+	dma_addr_t			status_mapping;
 };
 
 struct tg3 {
@@ -2546,11 +2553,6 @@ struct tg3 {
 	struct net_device		*dev;
 	struct pci_dev			*pdev;
 
-	struct tg3_hw_status		*hw_status;
-	dma_addr_t			status_mapping;
-	u32				last_tag;
-	u32				last_irq_tag;
-
 	u32				msg_enable;
 
 	/* begin "tx thread" cacheline section */