[Bug 290793] iovctl on mlx5en won't work

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290793

--- Comment #9 from Bjoern A. Zeeb <[email protected]> ---
(In reply to David BOYER from comment #6)

Hi,

thanks for the apparently simple sample.  I am still running into a prereq
problem:

I enabled SR-IOV in BIOS.
I enabled it in the Mellanox Firmware flexboot thingy.
GENERIC has SR-IOV support in it as much as I could see.

# ls -l /dev/iov
ls: /dev/iov: No such file or directory

# iovctl -C -f /etc/iovctl/mce0.conf
iovctl: Could not open device '/dev/iov/mlx5_core0': No such file or directory

What else needs doing to get this?

# pciconf -lBbcevV mlx5_core0
mlx5_core0@pci0:2:0:0:  class=0x020000 rev=0x00 hdr=0x00 vendor=0x15b3
device=0x1013 subvendor=0x15b3 subdevice=0x0008
    vendor     = 'Mellanox Technologies'
    device     = 'MT27700 Family [ConnectX-4]'
    class      = network
    subclass   = ethernet
    bar   [10] = type Prefetchable Memory, range 64, base 0x383ffc000000, size
33554432, enabled
    cap 10[60] = PCI-Express 2 endpoint max data 256(512) FLR NS
                 max read 512
                 link x16(x16) speed 8.0(8.0)
    cap 03[48] = VPD
    cap 11[9c] = MSI-X supports 128 messages, enabled
                 Table in map 0x10[0x2000], PBA in map 0x10[0x3000]
    cap 09[c0] = vendor (length 24)
    cap 01[40] = powerspec 3  supports D0 D3  current D0
    ecap 0003[100] = Serial 1 xxx
    ecap 0001[110] = AER 1 0 fatal 0 non-fatal 1 corrected
    ecap 000e[170] = ARI 1
    ecap 0019[1c0] = PCIe Sec 1 lane errors 0
  PCI-e errors = Correctable Error Detected
                 Unsupported Request Detected
     Corrected = Advisory Non-Fatal Error
    VPD ident  = 'CX416A - ConnectX-4 QSFP'
    VPD ro PN  = 'MCX416A-CCAT         '
    VPD ro EC  = 'A5'
    VPD ro SN  = 'MT1544X0xxxx            '
    VPD ro V0  = 'PCIeGen3 x16    '

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