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

[..]

quoted

quoted

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?