Dual Port NIC Passthrough Issue

[cwingert]

I am trying to pass a PCIe NIC with two ports through to a VM of Ubuntu 20.10.1 and the second port is not coming up.

I have tried adding "All Functions" and also tried adding the PCI Functions separately.

Both yield the result "igb: probe of xxxxxxx failed with error -13"

 

[Dunuin]

Did you tried it with a single entry "02:00" instead of "02:00.0" + "02:00.1"? That could help if your NIC, mainboard or CPU isn't able to use different IOMMU groups for single functions of a PCIe device (like if your CPU only supports VT-d but not VT-x).

 

[cwingert]

Did you tried it with a single entry "02:00" instead of "02:00.0" + "02:00.1"? That could help if your NIC, mainboard or CPU isn't able to use different IOMMU groups for single functions of a PCIe device (like if your CPU only supports VT-d but not VT-x).

Thanks for your response. Tried both ways of adding the card (all functions and individual functions).

 

[cwingert]

So this actually turned out to be an issue with the NIC itself. The hardware for the second port seems to hang once it is passed through to a guest OS. Even Proxmox (after a warm boot) showed the same error when initializing the second port on the NIC. The only way to get the second port out of that state was a cold boot or reset.

Passing through port 1 of the card and the motherboard NIC worked fine.

In addition, I picked up a NC365T on eBay and all 4 ports passed through just fine.

Thanks for your help!