librte_bpf: roadmap or any specific plans for this library

["Björn Svensson A" <bjorn.a.svensson@est.tech>]

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Hi all,
I hope this is the correct maillist for this topic.

DPDK provides the nice library `librte_bpf` to load and execute eBPF bytecode
and we would like to broaden our usage of this library.

Today there are hints that this library might have been purpose built to enable inspection or modification of packets;
for example the eBPF program is expected to only use a single input argument, pointing to data of some sort.
We believe it would be beneficial to be able to use this library to run generic eBPF programs as well,
as an alternative to run them as RX- TX-port/queue callbacks (i.e. generic programs which only uses supported features)

I have seen some discussions regarding moving towards using a common library with the kernel implementation of bpf,
but I couldn't figure out the outcome.
My question is if there any plans to evolve this library or would improvements possibly be accepted?

Here are some improvements we are interested to look into:

* Add additional API for loading eBPF code.
  Today it's possible to load eBPF code from an ELF file, but having an API to load code from an ELF image from memory
  would open up for other ways to manage eBPF code.

  Example of the new API:
    struct rte_bpf *
    rte_bpf_elf_image_load(const struct rte_bpf_prm *prm, char *image,
                           size_t size, const char *sname);

* Add support of more than a single input argument.
  There are cases when additional information is needed. Being able to use more than a single input argument
  would help when running generic eBPF programs.

  Example of change:
       struct rte_bpf_prm {
       ...
    -    struct rte_bpf_arg prog_arg; /**< eBPF program input arg description */
    +    uint32_t nb_args;
    +    struct rte_bpf_arg prog_args[EBPF_FUNC_MAX_ARGS]; /**< eBPF program input args */
       };

Any feedback regarding this is welcomed.
Best regard
Bjorn


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