freebsd stable - Nov 2019 - device_attach: ixv0 attach returned 5

Hi,

I?m trying to get SR-IOV working with my two port Intel 10G NIC:

ix0 at pci0:3:0:0:	class=0x020000 card=0x15ad15d9 chip=0x15ad8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552/X557-AT 10GBASE-T'
    class      = network
    subclass   = ethernet
ix1 at pci0:3:0:1:	class=0x020000 card=0x15ad15d9 chip=0x15ad8086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552/X557-AT 10GBASE-T'
    class      = network
    subclass   = ethernet

with this iovctl config:

# cat /etc/iovctl_ix1.conf 
PF {
    device: "ix1";
    num_vfs: 4;
}

I get 4 PCI devices created:

none57 at pci0:3:0:129:	class=0x020000 card=0x15ad15d9 chip=0x15a88086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552 Virtual Function'
    class      = network
    subclass   = ethernet
none58 at pci0:3:0:131:	class=0x020000 card=0x15ad15d9 chip=0x15a88086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552 Virtual Function'
    class      = network
    subclass   = ethernet
none59 at pci0:3:0:133:	class=0x020000 card=0x15ad15d9 chip=0x15a88086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552 Virtual Function'
    class      = network
    subclass   = ethernet
none60 at pci0:3:0:135:	class=0x020000 card=0x15ad15d9 chip=0x15a88086 rev=0x00
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X552 Virtual Function'
    class      = network
    subclass   = ethernet

But the driver fails to attach with following errors:

ixv0: <Intel(R) PRO/10GbE Virtual Function Network Driver> at device 0.129
on pci4
ixv0: ...reset_hw() failure: Reset Failed!
ixv0: IFDI_ATTACH_PRE failed 5
device_attach: ixv0 attach returned 5
ixv0: <Intel(R) PRO/10GbE Virtual Function Network Driver> at device 0.131
on pci4
ixv0: ...reset_hw() failure: Reset Failed!
ixv0: IFDI_ATTACH_PRE failed 5
device_attach: ixv0 attach returned 5
ixv0: <Intel(R) PRO/10GbE Virtual Function Network Driver> at device 0.133
on pci4
ixv0: ...reset_hw() failure: Reset Failed!
ixv0: IFDI_ATTACH_PRE failed 5
device_attach: ixv0 attach returned 5
ixv0: <Intel(R) PRO/10GbE Virtual Function Network Driver> at device 0.135
on pci4
ixv0: ...reset_hw() failure: Reset Failed!
ixv0: IFDI_ATTACH_PRE failed 5
device_attach: ixv0 attach returned 5

I?m running 12-STABLE. Is this a hardware related or possibly a driver bug?

regards
Michal