Re: [PATCH net] virtio-net: reject small vring sizes

[Michael S. Tsirkin]

On Mon, Apr 17, 2023 at 07:07:59AM +0000, Alvaro Karsz wrote:
> > Why tx timeout without frags?
> 
> Please see my response to Michael.
> 
> > > * Guest GSO/big MTU (without VIRTIO_NET_F_MRG_RXBUF?), we can't chain page size buffers anymore.
> > 
> > 
> > Or, we disable the GUEST_GSO, HOST_GSO......
> > 
> And disable VIRTIO_NET_F_MTU, quoting the spec:
> "A driver SHOULD negotiate VIRTIO_NET_F_MTU if the device offers it."

If you don't the nic can still get jumbo packets it will just drop them ...

> We can find a way around using buffers bigger than a page size like Michael implied.