ixv: Add Hyper-V virtual function support

Hyper-V does not expose the normal Intel PF/VF mailbox.

Import the Hyper-V operation overrides from DPDK and complete its reset
callback with the configuration-space mechanism submitted by Microsoft.
Route ixv operations through the operation table, use mailbox API 1.0,
and limit this environment to one queue pair.

Claim the 82599, X540, X550, X550EM-X, and X550EM-A Hyper-V device IDs
listed by DPDK.  Select the same path for the E610 Hyper-V subdevice
identity defined there.

For E610/Linkville, read the emulated VFLINKS-format status from PCI
configuration space at offset 0x209.  Older families retain the MMIO
VFLINKS path.

Treat receive-mode changes as host-owned no-ops and do not retry VLAN
operations that Hyper-V permanently rejects.  Limit the Hyper-V 82599
MTU to 1504 because its VF does not implement the X540 RLPML field.

Use mailbox reset indications only to refresh cached Hyper-V link state.
Hyper-V does not provide the mailbox handshake required to treat that
indication as a request for an iflib reinitialization.

Tested on 82599 and E610 (with a followup commit) with Windows Server
2025 Hyper-V.

PR:		232472, 239849
Obtained from:	DPDK (shared code)
Sponsored by:	BBOX.io
Co-authored-by:	Wei Hu <weh@microsoft.com>

0 files changed, 0 insertions, 0 deletions