[dpdk-dev] PCI domain size

[Stephen Hemminger]

While working on SR-IOV support on Azure, it was discovered that some applications
and drivers do not support full size PCI domains. On Azure environment the PCI pass
through device has a synthetic domain value (ie generated by host) which is > 16 bits.

The common PCI utilities (pci-utils) and Linux kernel both support
full 32 bits but DPDK does not. FreeBSD also supports 32 bit domains.

Changing the one place in DPDK (rte_pci.h) in source is trivial but of course
it is a major ABI breakage which is a complete flag day. I.e no binary compatiabilty
is possible.