v2 changes:
 change LOG level from ERR to INFO

virtio PMD could use IO port to configure the virtio device without
using uio driver.

There are two issues with previous implementation:
1) virtio PMD will take over each virtio device blindly even if some
are not intended for DPDK.
2) driver conflict between virtio PMD and virtio-net kernel driver.

This patch checks if there is any kernel driver manipulating the virtio
device before virtio PMD uses IO port to configure the device.

Fixes: da978dfdc43b ("virtio: use port IO to get PCI resource")

Signed-off-by: Huawei Xie <redacted>
---
 drivers/net/virtio/virtio_ethdev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index e815acd..7a50dac 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c

@@ -1138,6 +1138,13 @@ static int virtio_resource_init_by_ioports(struct rte_pci_device *pci_dev)
 	int found = 0;
 	size_t linesz;
 
+	if (pci_dev->kdrv != RTE_KDRV_NONE) {
+		PMD_INIT_LOG(INFO,
+			"kernel driver is manipulating this device." \
+			" Please unbind the kernel driver.");
+		return -1;
+	}
+
 	snprintf(pci_id, sizeof(pci_id), PCI_PRI_FMT,
 		 pci_dev->addr.domain,
 		 pci_dev->addr.bus,

-- 
1.8.1.4