An earlier email sent today to this distribution incorrectly claimed that dpdk-devbind.py was not working on Amazon Linux 2 Kernel 5.10.
This was my error. IOMMU was not turned on. I thought it default ON; it does not even for c5n.metal instances.
The correct steps are:
* follow https://doc.dpdk.org/guides/nics/ena.html under "On AWS, the metal instances are supporting IOMMU for both arm64 and x86_64 hosts" to enable IOMMU by modifying grub boot file.