Merge branch 'gve-dqo'

Bailey Forrest says:

====================
gve: Introduce DQO descriptor format

DQO is the descriptor format for our next generation virtual NIC. The existing
descriptor format will be referred to as "GQI" in the patch set.

One major change with DQO is it uses dual descriptor rings for both TX and RX
queues.

The TX path uses a TX queue to send descriptors to HW, and receives packet
completion events on a TX completion queue.

The RX path posts buffers to HW using an RX buffer queue and receives incoming
packets on an RX queue.

One important note is that DQO descriptors and doorbells are little endian. We
continue to use the existing big endian control plane infrastructure.

The general format of the patch series is:
- Refactor existing code/data structures to be shared by DQO
- Expand admin queues to support DQO device setup
- Expand data structures and device setup to support DQO
- Add logic to setup DQO queues
- Implement datapath
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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