How to add veth interfaces in dpdk - dpdk

Question

I need to create a veth device for the slowpath for control packets.
What I tried till now:
I have created veth interfaces using below command
sudo ip link add veth1-2 type veth peer name veth2-1
when I use command sudo dpdk-devbind.py --bind=igb_uio veth1-2 to add veth into dpdk.
It gives me an error that "Unknown device: veth2-1
Is there any way we can add veth interfaces in dpdk ?

Answer 1

If you want a "dpdk-solution", then what you'll want to look at is KNI: https://doc.dpdk.org/guides/prog_guide/kernel_nic_interface.html
From their docs:
The DPDK Kernel NIC Interface (KNI) allows userspace applications access to the Linux* control plane.
The benefits of using the DPDK KNI are:
Faster than existing Linux TUN/TAP interfaces (by eliminating system
calls and copy_to_user()/copy_from_user() operations.
Allows management of DPDK ports using standard Linux net tools such as
ethtool, ifconfig and tcpdump.
Allows an interface with the kernel network stack.
If your fine using a non-dpdk solution, then a TUN/TAP device is a typical way to interface with the networking stack. Your application would receive packets on the dpdk-controlled nic, and if it is a control packet you would simply forward it on to the TUN/TAP device (or KNI if using DPDK's version of TUN/TAP). Similarly for the other direction, if the TUN/TAP/KNI device receives a packet from the networking stack, you would simply send it out the DPDK physical nic.