Re: RE: RE: RE: [PATCH v16] virtio-net: support device stats

[Xuan Zhuo <xuanzhuo@linux.alibaba.com>]

On Mon, 4 Sep 2023 08:08:57 +0000, Parav Pandit <parav@nvidia.com> wrote:
>
> > From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > Sent: Monday, September 4, 2023 1:32 PM
> > > If so, how will the receive device can receive such large packet when the
> > posted buffer is not worth the 64KB size?
> >
> > The virtio-net merge mode.
>
> that is only fine when the mtu is 64K or when mtu is not negotiated.
> Because in spec we have
>
> "The device MUST NOT pass received packets that exceed mtu (plus low level ethernet header length) size
> with gso_type NONE or ECN after VIRTIO_NET_F_MTU has been successfully negotiated."

NO.

If the mtu is 1500, we can pass 64k packets to the driver with gso_type (not NONE).

Thanks.



>
> We need to update the definition of those gso counter to indicate above two conditions.