Help Running Example

[Alan Beadle <ab.beadle@gmail.com>]

Hi,

I need some help getting DPDK working. I am running Ubuntu 20.04 with
a modified Linux 5.4 kernel, but I have also tried the stock Ubuntu
5.15 kernel with the same results.

Here is my NIC info from lspci:
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (3)
I219-LM (rev 09)

I built and installed DPDK from source, and applied the following boot
flags: "intel_iommu=on iommu=pt"

After booting I did the following as root:
echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
ifconfig enp0s31f6 down
dpdk-devbind.py --bind=vfio-pci 0000:00:1f.6

All of this appeared to work.

I tried running the "skeleton" example program and got the following output:
sudo ./build/basicfwd
EAL: Detected CPU lcores: 16
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
EAL: 0000:00:1f.6 VFIO group is not viable! Not all devices in IOMMU
group bound to VFIO or unbound
EAL: Requested device 0000:00:1f.6 cannot be used
TELEMETRY: No legacy callbacks, legacy socket not created
EAL: Error - exiting with code: 1
  Cause: Error: number of ports must be even

I'm not at all familiar with DPDK or VFIO. What might the problem be?

-Alan