[dpdk-dev] [PATCH 4/4] virtio: check if any kernel driver is manipulating the device

[Xie, Huawei]

On 12/25/2015 6:33 PM, Xie, Huawei wrote:
> 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 <huawei.xie at intel.com>
> ---
>  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 00015ef..504346a 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(ERR,
Better change ERR to INFO and revise the message followed, since user
might not want to use this device for DPDK.
> +			"%s(): kernel driver is manipulating this device." \
> +			" Please unbind the kernel driver.", __func__);
> +		return -1;
> +	}
> +
>  	snprintf(pci_id, sizeof(pci_id), PCI_PRI_FMT,
>  		 pci_dev->addr.domain,
>  		 pci_dev->addr.bus,