Cleanup virtio code by eliminating unnecessary nesting of
virtio hardware structure inside adapter structure.
Also allows removing unneeded macro, making code clearer.

---
 lib/librte_pmd_virtio/virtio_ethdev.c |   31 +++++++++++--------------------
 lib/librte_pmd_virtio/virtio_ethdev.h |    9 ---------
 lib/librte_pmd_virtio/virtio_rxtx.c   |    3 +--
 3 files changed, 12 insertions(+), 31 deletions(-)

--- a/lib/librte_pmd_virtio/virtio_ethdev.c	2014-08-25 19:00:08.310541279 -0700
+++ b/lib/librte_pmd_virtio/virtio_ethdev.c	2014-08-25 19:00:08.310541279 -0700
@@ -203,8 +203,7 @@ virtio_send_command(struct virtqueue *vq
 static int
 virtio_set_multiple_queues(struct rte_eth_dev *dev, uint16_t nb_queues)
 {
-	struct virtio_hw *hw
-		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 	struct virtio_pmd_ctrl ctrl;
 	int dlen[1];
 	int ret;
@@ -238,8 +237,7 @@ int virtio_dev_queue_setup(struct rte_et
 	const struct rte_memzone *mz;
 	uint16_t vq_size;
 	int size;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 	struct virtqueue  *vq = NULL;
 
 	/* Write the virtqueue index to the Queue Select Field */
@@ -379,8 +377,7 @@ virtio_dev_cq_queue_setup(struct rte_eth
 	struct virtqueue *vq;
 	uint16_t nb_desc = 0;
 	int ret;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 
 	PMD_INIT_FUNC_TRACE();
 	ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
@@ -765,8 +762,7 @@ virtio_interrupt_handler(__rte_unused st
 			 void *param)
 {
 	struct rte_eth_dev *dev = param;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 	uint8_t isr;
 
 	/* Read interrupt status which clears interrupt */
@@ -792,12 +788,11 @@ static int
 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 		struct rte_eth_dev *eth_dev)
 {
+	struct virtio_hw *hw = eth_dev->data->dev_private;
 	struct virtio_net_config *config;
 	struct virtio_net_config local_config;
 	uint32_t offset_conf = sizeof(config->mac);
 	struct rte_pci_device *pci_dev;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
 
 	if (RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr)) {
 		PMD_INIT_LOG(ERR,
@@ -928,7 +923,7 @@ static struct eth_driver rte_virtio_pmd
 		.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
 	},
 	.eth_dev_init = eth_virtio_dev_init,
-	.dev_private_size = sizeof(struct virtio_adapter),
+	.dev_private_size = sizeof(struct virtio_hw),
 };
 
 /*
@@ -965,8 +960,7 @@ static int
 virtio_dev_configure(struct rte_eth_dev *dev)
 {
 	const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 	int ret;
 
 	PMD_INIT_LOG(DEBUG, "configure");
@@ -990,8 +984,7 @@ static int
 virtio_dev_start(struct rte_eth_dev *dev)
 {
 	uint16_t nb_queues, i;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 
 	/* Tell the host we've noticed this device. */
 	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
@@ -1097,8 +1090,7 @@ static void virtio_dev_free_mbufs(struct
 static void
 virtio_dev_stop(struct rte_eth_dev *dev)
 {
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 
 	/* reset the NIC */
 	vtpci_irq_config(hw, 0);
@@ -1111,8 +1103,7 @@ virtio_dev_link_update(struct rte_eth_de
 {
 	struct rte_eth_link link, old;
 	uint16_t status;
-	struct virtio_hw *hw =
-		VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 	memset(&link, 0, sizeof(link));
 	virtio_dev_atomic_read_link_status(dev, &link);
 	old = link;
@@ -1144,7 +1135,7 @@ virtio_dev_link_update(struct rte_eth_de
 static void
 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 {
-	struct virtio_hw *hw = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 
 	dev_info->driver_name = dev->driver->pci_drv.name;
 	dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
--- a/lib/librte_pmd_virtio/virtio_ethdev.h	2014-08-25 19:00:08.310541279 -0700
+++ b/lib/librte_pmd_virtio/virtio_ethdev.h	2014-08-25 19:00:08.310541279 -0700
@@ -110,15 +110,6 @@ uint16_t virtio_recv_mergeable_pkts(void
 uint16_t virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 		uint16_t nb_pkts);
 
-/*
- * Structure to store private data for each driver instance (for each port).
- */
-struct virtio_adapter {
-	struct virtio_hw hw;
-};
-
-#define VIRTIO_DEV_PRIVATE_TO_HW(adapter)\
-	(&((struct virtio_adapter *)adapter)->hw)
 
 /*
  * The VIRTIO_NET_F_GUEST_TSO[46] features permit the host to send us
--- a/lib/librte_pmd_virtio/virtio_rxtx.c	2014-08-25 19:00:08.310541279 -0700
+++ b/lib/librte_pmd_virtio/virtio_rxtx.c	2014-08-25 19:00:08.310541279 -0700
@@ -326,8 +326,7 @@ virtio_dev_vring_start(struct virtqueue
 void
 virtio_dev_cq_start(struct rte_eth_dev *dev)
 {
-	struct virtio_hw *hw
-		= VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct virtio_hw *hw = dev->data->dev_private;
 
 	virtio_dev_vring_start(hw->cvq, VTNET_CQ);
 	VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);