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74c9fd72cf
Add support for the "DQO" out-of-order transmit and receive queue formats. These are almost entirely different in format and usage (and even endianness) from the original "GQI" in-order transmit and receive queues, and arguably should belong to a completely different device with a different PCI ID. However, Google chose to essentially crowbar two unrelated device models into the same virtual hardware, and so we must handle both of these device models within the same driver. Most of the new code exists solely to handle the differences in descriptor sizes and formats. Out-of-order completions are handled via a buffer ID ring (as with other devices supporting out-of-order completions, such as the Xen, Hyper-V, and Amazon virtual NICs). A slight twist is that on the transmit datapath (but not the receive datapath) the Google NIC provides only one completion per packet instead of one completion per descriptor, and so we must record the list of chained buffer IDs in a separate array at the time of transmission. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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