ixgbe: Add ethtool offline test support

This patch adds support for the ethtool internal test engine.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe.h

@@ -223,6 +223,10 @@ struct ixgbe_q_vector {
 #define IXGBE_TX_CTXTDESC_ADV(R, i)	    \
 	(&(((struct ixgbe_adv_tx_context_desc *)((R).desc))[i]))
 
+#define IXGBE_GET_DESC(R, i, type)	(&(((struct type *)((R).desc))[i]))
+#define IXGBE_TX_DESC(R, i)	IXGBE_GET_DESC(R, i, ixgbe_legacy_tx_desc)
+#define IXGBE_RX_DESC(R, i)	IXGBE_GET_DESC(R, i, ixgbe_legacy_rx_desc)
+
 #define IXGBE_MAX_JUMBO_FRAME_SIZE        16128
 #ifdef IXGBE_FCOE
 /* Use 3K as the baby jumbo frame size for FCoE */
@@ -327,6 +331,10 @@ struct ixgbe_adapter {
 	struct pci_dev *pdev;
 	struct net_device_stats net_stats;
 
+	u32 test_icr;
+	struct ixgbe_ring test_tx_ring;
+	struct ixgbe_ring test_rx_ring;
+
 	/* structs defined in ixgbe_hw.h */
 	struct ixgbe_hw hw;
 	u16 msg_enable;