[Bug 251226] ixgbe: resume from real S3 suspend resets the whole system (Intel X520 NIC)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251226

            Bug ID: 251226
           Summary: ixgbe: resume from real S3 suspend resets the whole
                    system (Intel X520 NIC)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

The ix driver seems to have actual suspend-resume support, which is nice.
However..

With this device ("X520"):

ix0 at pci0:44:0:0:        class=0x020000 rev=0x01 hdr=0x00 vendor=0x8086
device=0x10fb subvendor=0x8086 subdevice=0x0006
    vendor     = 'Intel Corporation'
    device     = '82599ES 10-Gigabit SFI/SFP+ Network Connection'

everything works great under debug.acpi.suspend_bounce=1, but resuming from
*real* S3 sleep results in failure — namely instant system reset, without a
coredump :( How to even debug this?

Mainboard LED blinks, GPU LEDs turn on, NIC LEDs turn on and boom reset,
mainboard LED blinks again indicating reboot, system boots again freshly. If
that matters: the platform is AMD X370 (1st gen Ryzen), the NIC is connected to
the bottom (chipset) PCIe slot. However a Mellanox (mlx4en) NIC in the same
slot does survive suspend-resume cycles, apart from panicking sometimes because
there's no actual support for suspend-resume in mlx4 (bug 251154).

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