[Bug 234553] [cxgbe][pci][ppt] T420-CR VF fails probe by ppt module for bhyve

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234553

            Bug ID: 234553
           Summary: [cxgbe][pci][ppt] T420-CR VF fails probe by ppt module
                    for bhyve
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ryan at freqlabs.com

Using `iovctl` I can create VFs for cxgbe0, cxgbe1. They show up in `pciconf
-lv` in the ppt devclass. However, most of the device configuration appears to
be invalid (see pciconf output below). In particular, the hdr=0x7f means
`ppt_probe()` will return ENXIO for the device instead of BUS_PROBE_WILDCARD,
preventing the device from being passed through to a bhyve VM.

I naively tried modifying the vmm driver to bypass the cfg.hdrtype check, which
allowed me to pass the device through to a VM, but the kernel in the VM then
failed to recognize the VF as anything. It is not present in `pciconf -l`
inside the VM and I see no messages about it in the VM console.

dev.t4nex.0.firmware_version: 1.19.1.0

ppt0 at pci0:1:1:0:        class=0xffffff card=0x00000000 chip=0x48011425 rev=0xff
hdr=0x7f
    vendor     = 'Chelsio Communications Inc'
    device     = 'T420-CR Unified Wire Ethernet Controller [VF]'

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