Support SR-IOV

[alexforencich]

SR-IOV is useful both for virtualization applications and for mixing use of the normal linux kernel driver other drivers, including a DPDK driver. Supporting SR-IOV will require sever changes to corundum, including tracking the PCIe function associated with each operation, the ability to assign queues to PCIe functions, and the ability to restrict access to various control registers based on the PCIe function.

[alexforencich]

Corundum now uses MSI-X instead of MSI, which is one step towards SR-IOV support. New queue management logic that is currently in development will include a VF ID field in the queue state to support assigning queues to VFs.