[dpdk-dev] [RFC 2/2] net/tap: add eBPF instructions

[Thomas Monjalon]

30/11/2017 17:54, Stephen Hemminger:
> Loading BPF is a could solution to doing dynamic flow matching.
> It needs to be done differently to be accepted.
> 
> Putting raw machine instructions in source code is as bad as binary
> blobs. You need to provide original source of program and then have
> build instructions to create any needed code.

The source program is provided in this patch: tap_bpf_program.c
It is pre-compiled to avoid requiring too many dependencies when building DPDK.

> There licensing concerns here as well. Any BPF program inserted
> in the kernel must be GPL. So you need to provide source.
> 
> Given the license overlap you should also document that in the rte_flow_tap.rst
> file.
> 
> The program that loads the program can be BSD, it just needs to pick
> up the BPF firmware file from a compiled ELF image.

The program that loads BPF is the TAP PMD itself.