[OASIS Issue Tracker] Created: (VIRTIO-15) Simplify indirect descriptors

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Simplify indirect descriptors
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                 Key: VIRTIO-15
                 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-15
             Project: OASIS Virtual I/O Device (VIRTIO) TC
          Issue Type: Improvement
            Reporter: Rusty Russell


The current definition of VIRTIO_DESC_F_INDIRECT is that it stacks: you can set that bit and VIRTIO_DESC_F_NEXT and after processing the (only single level!) of indirect descriptors, the device then processes the next descriptor as normal (which may also be indirect).  No implementation I am aware of generates such multi-part indirect descriptors, but they could be useful if we allow huge indirect descriptors as proposed.

Perhaps we should make the bit chain, so if any descriptor has that set, we start traversing that descriptor as a new table, and never return.  This is simpler to implement, and backwards compatible as well.

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