netdev - RE: [PATCH V3 3/6] vDPA: allow userspace to query features of a vDPA device

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Date:   Wed, 6 Jul 2022 02:28:04 +0000
From:   Parav Pandit <parav@...dia.com>
To:     "Zhu, Lingshan" <lingshan.zhu@...el.com>,
        Jason Wang <jasowang@...hat.com>,
        "mst@...hat.com" <mst@...hat.com>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "xieyongji@...edance.com" <xieyongji@...edance.com>,
        "gautam.dawar@....com" <gautam.dawar@....com>
Subject: RE: [PATCH V3 3/6] vDPA: allow userspace to query features of a vDPA
 device


> From: Zhu, Lingshan <lingshan.zhu@...el.com>
> Sent: Tuesday, July 5, 2022 10:25 PM
> 1. When migrate the VM to a node which has a more resourceful device. If
> the source side device does not have MQ, RSS or TSO feature, the vDPA
> device assigned to the VM does not have MQ, RSS or TSO as well. When
> migrating to a node which has a device with MQ, RSS or TSO, to provide a
> consistent network device to the guest, to be transparent to the guest, we
> need to mask out MQ, RSS or TSO in the vDPA device when provisioning.
> This is an example that management device may have different feature bits
> than the vDPA device.
Yes. Right.