On Fri, Sep 16, 2016 at 01:39:15AM +0300, Michael S. Tsirkin wrote:
> The idea is to have a r/w descriptor in a ring structure,
> replacing the used and available ring, index and descriptor
> buffer.

This is probably obvious but:

Why is the desc.index field needed?

The index field would be needed if the driver had to jump over a DESC_HW
descriptor when adding descriptors, but that doesn't seem necessary
since the device is supposed to overwrite descriptors in ascending ring
order when they complete out-of-order.

Stefan

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