[PATCH v2 2/7] net/virtio_user: postpone DRIVER OK notification

[Jianfeng Tan <jianfeng.tan@intel.com>]

In driver probe phase, we obtain device information; and then virtio
driver will initialize device and stores info, like negotiated
features, in vhost_user layer; finally, vhost_user gets DRIVER_OK
notification from virtio driver, and then sync with backend device.

Previously, DRIVER_OK could be sent twice: 1. when ether layer invokes
eth_device_init to initialize device; 2. when user configures it with
different configuration from that of previous.

Since we can only depend on DRIVER_OK notification to sync with backend
device, we postpone it to virtio_dev_start when everything is settled.

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 079fd6c..d54b1bb 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1276,7 +1276,6 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 	ret = virtio_alloc_queues(eth_dev);
 	if (ret < 0)
 		return ret;
-	vtpci_reinit_complete(hw);
 
 	if (pci_dev)
 		PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
@@ -1474,6 +1473,8 @@ virtio_dev_start(struct rte_eth_dev *dev)
 	struct virtnet_tx *txvq __rte_unused;
 	struct virtio_hw *hw = dev->data->dev_private;
 
+	vtpci_reinit_complete(hw);
+
 	/* check if lsc interrupt feature is enabled */
 	if (dev->data->dev_conf.intr_conf.lsc) {
 		if (!(dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)) {
-- 
2.7.4