[PATCH] net/virtio: unmap PCI device in secondary process

[Xia, Chenbo]

> -----Original Message-----
> From: Wang, YuanX <yuanx.wang at intel.com>
> Sent: Thursday, April 21, 2022 7:16 PM
> To: maxime.coquelin at redhat.com; Xia, Chenbo <chenbo.xia at intel.com>
> Cc: dev at dpdk.org; Hu, Jiayu <jiayu.hu at intel.com>; He, Xingguang
> <xingguang.he at intel.com>; Wang, YuanX <yuanx.wang at intel.com>
> Subject: [PATCH] net/virtio: unmap PCI device in secondary process
> 
> In multi-process, the secondary process will remap PCI during
> initialization, but the mapping is not removed in the uninit path,
> the device is not closed, and the device busy error will be reported
> when the device is hotplugged.
> 
> This patch unmap PCI device at secondary process uninitialization

unmaps

> based on virtio_rempa_pci().

Virtio_remap_pci

> 
> Fixes: 36a7a2e7a53 ("net/virtio: move PCI device init in dedicated file")

Miss cc-stable tag. Patch LGTM

Thanks,
Chenbo

> 
> Signed-off-by: Yuan Wang <yuanx.wang at intel.com>
> ---
>  drivers/net/virtio/virtio_pci_ethdev.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio/virtio_pci_ethdev.c
> b/drivers/net/virtio/virtio_pci_ethdev.c
> index 54645dc62e..1f6bdeddda 100644
> --- a/drivers/net/virtio/virtio_pci_ethdev.c
> +++ b/drivers/net/virtio/virtio_pci_ethdev.c
> @@ -122,10 +122,20 @@ static int
>  eth_virtio_pci_uninit(struct rte_eth_dev *eth_dev)
>  {
>  	int ret;
> +	struct virtio_pci_dev *dev;
> +	struct virtio_hw *hw;
>  	PMD_INIT_FUNC_TRACE();
> 
> -	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
> +	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
> +		dev = eth_dev->data->dev_private;
> +		hw = &dev->hw;
> +
> +		if (dev->modern)
> +			rte_pci_unmap_device(RTE_ETH_DEV_TO_PCI(eth_dev));
> +		else
> +			vtpci_legacy_ioport_unmap(hw);
>  		return 0;
> +	}
> 
>  	ret = virtio_dev_stop(eth_dev);
>  	virtio_dev_close(eth_dev);
> --
> 2.25.1