[dpdk-dev] [PATCH v2 12/19] vhost: remove dependency on priv field

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

This change could let us avoid the dependency of "virtio_net"
struct, to prepare for the ABI refactoring.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 13 +++++++------
 examples/vhost/main.c             | 18 ++++++++++++++++--
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index 6fa9f6b..de0f25e 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -275,7 +275,6 @@ new_device(struct virtio_net *dev)
 	for (i = 0; i < rte_vhost_get_queue_num(dev->vid) * VIRTIO_QNUM; i++)
 		rte_vhost_enable_guest_notification(dev, i, 0);
 
-	dev->priv = eth_dev;
 	eth_dev->data->dev_link.link_status = ETH_LINK_UP;
 
 	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
@@ -303,6 +302,8 @@ destroy_device(volatile struct virtio_net *dev)
 {
 	struct rte_eth_dev *eth_dev;
 	struct vhost_queue *vq;
+	struct internal_list *list;
+	char ifname[PATH_MAX];
 	unsigned i;
 
 	if (dev == NULL) {
@@ -310,11 +311,13 @@ destroy_device(volatile struct virtio_net *dev)
 		return;
 	}
 
-	eth_dev = (struct rte_eth_dev *)dev->priv;
-	if (eth_dev == NULL) {
-		RTE_LOG(INFO, PMD, "Failed to find a ethdev\n");
+	rte_vhost_get_ifname(dev->vid, ifname, sizeof(ifname));
+	list = find_internal_resource(ifname);
+	if (list == NULL) {
+		RTE_LOG(ERR, PMD, "Invalid interface name: %s\n", ifname);
 		return;
 	}
+	eth_dev = list->eth_dev;
 
 	/* Wait until rx/tx_pkt_burst stops accessing vhost device */
 	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
@@ -336,8 +339,6 @@ destroy_device(volatile struct virtio_net *dev)
 
 	eth_dev->data->dev_link.link_status = ETH_LINK_DOWN;
 
-	dev->priv = NULL;
-
 	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 		vq = eth_dev->data->rx_queues[i];
 		if (vq == NULL)
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 67ef0ad..c408577 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -700,6 +700,19 @@ find_vhost_dev(struct ether_addr *mac)
 	return NULL;
 }
 
+static inline struct vhost_dev *__attribute__((always_inline))
+find_vhost_dev_by_vid(int vid)
+{
+	struct vhost_dev *vdev;
+
+	TAILQ_FOREACH(vdev, &vhost_dev_list, next) {
+		if (vdev->ready == DEVICE_RX && vdev->vid == vid)
+			return vdev;
+	}
+
+	return NULL;
+}
+
 /*
  * This function learns the MAC address of the device and registers this along with a
  * vlan tag to a VMDQ.
@@ -1175,7 +1188,9 @@ destroy_device (volatile struct virtio_net *dev)
 	struct vhost_dev *vdev;
 	int lcore;
 
-	vdev = (struct vhost_dev *)dev->priv;
+	vdev = find_vhost_dev_by_vid(dev->vid);
+	if (!vdev)
+		return;
 	/*set the remove flag. */
 	vdev->remove = 1;
 	while(vdev->ready != DEVICE_SAFE_REMOVE) {
@@ -1228,7 +1243,6 @@ new_device (struct virtio_net *dev)
 		return -1;
 	}
 	vdev->dev = dev;
-	dev->priv = vdev;
 	vdev->vid = vid;
 
 	TAILQ_INSERT_TAIL(&vhost_dev_list, vdev, next);
-- 
1.9.0