netdev - RE: [PATCH iwl-next v3 13/13] vfio/ice: Implement vfio

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Date: Fri, 13 Oct 2023 08:52:07 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Cao, Yahui" <yahui.cao@...el.com>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Liu, Lingyu" <lingyu.liu@...el.com>, "Chittim,
 Madhu" <madhu.chittim@...el.com>, "Samudrala, Sridhar"
	<sridhar.samudrala@...el.com>, "alex.williamson@...hat.com"
	<alex.williamson@...hat.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"yishaih@...dia.com" <yishaih@...dia.com>,
	"shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>, "brett.creeley@....com"
	<brett.creeley@....com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, "Brandeburg,
 Jesse" <jesse.brandeburg@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>
Subject: RE: [PATCH iwl-next v3 13/13] vfio/ice: Implement vfio_pci driver for
 E800 devices

> From: Cao, Yahui <yahui.cao@...el.com>
> Sent: Monday, September 18, 2023 2:26 PM
>
> +static struct file *
> +ice_vfio_pci_step_device_state_locked(struct ice_vfio_pci_core_device
> *ice_vdev,
> +				      u32 new, u32 final)
> +{
> +	u32 cur = ice_vdev->mig_state;
> +	int ret;
> +
> +	if (cur == VFIO_DEVICE_STATE_RUNNING && new ==
> VFIO_DEVICE_STATE_RUNNING_P2P) {
> +		ice_migration_suspend_dev(ice_vdev->pf, ice_vdev->vf_id);
> +		return NULL;
> +	}
> +
> +	if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && new ==
> VFIO_DEVICE_STATE_STOP)
> +		return NULL;
> +

Jason, above is one open which your clarification is appreciated.

>From my talk with Yahui this device can drain/stop outgoing
traffic but has no interface to stop incoming request.

is it OK to do nothing for RUNNING_P2P->STOP transition like above?