RE: [PATCH v5 2/2] virtio-net: use mtu size as buffer length for big packets

[Parav Pandit <parav@nvidia.com>]

> From: Michael S. Tsirkin <mst@redhat.com>
> Sent: Wednesday, September 7, 2022 10:30 AM

[..]
> > > actually how does this waste space? Is this because your device does
> > > not have INDIRECT?
> > VQ is 256 entries deep.
> > Driver posted total of 256 descriptors.
> > Each descriptor points to a page of 4K.
> > These descriptors are chained as 4K * 16.
> 
> So without indirect then? with indirect each descriptor can point to 16
> entries.
> 
With indirect, can it post 256 * 16 size buffers even though vq depth is 256 entries?
I recall that total number of descriptors with direct/indirect descriptors is limited to vq depth.
Was there some recent clarification occurred in the spec to clarify this?