Re: dpdk-testpmd on XDP

[Alessio Igor Bogani <alessio.bogani@elettra.eu>]

Stephen,

Thanks for your reply!

On Tue, 19 Mar 2024 at 17:07, Stephen Hemminger
<stephen@networkplumber.org> wrote:
>
> On Tue, 19 Mar 2024 11:48:53 +0100
> Alessio Igor Bogani <alessio.bogani@elettra.eu> wrote:
>
> > The only suspicious part in the output of the dpdk-testpmd utility is:
> > [...]
> > libxdp: XDP flag not supported by libxdp.
> > libbpf: prog 'xdp_dispatcher': BPF program load failed: Invalid argument
> > libbpf: prog 'xdp_dispatcher': -- BEGIN PROG LOAD LOG --
> > Validating prog0() func#1...
> > btf_vmlinux is malformed
> > Arg#0 type PTR in prog0() is not supported yet.
> > processed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0
> > peak_states 0 mark_read 0
> > -- END PROG LOAD LOG --
> > libbpf: failed to load program 'xdp_dispatcher'
> > libbpf: failed to load object 'xdp-dispatcher.o'
> > libxdp: Failed to load dispatcher: Invalid argument
> > libxdp: Falling back to loading single prog without dispatcher
> > [...]
>
> What distribution and kernel version?

Custom distribution (Yocto Kirkstone) using 5.10.184.All parts
(kernel, DPDK, libbpf, xdp-tools) are built (cross-compiled) from
source.

> BPF/XDP has changed a lot over last couple of years and not maintained
> compatibility.  If you are building your own kernel, likely need to build
> the xdp library as well.  If getting from a distro (Fedora, Ubuntu, Debian, etc)

Using libbpf 0.7.0 and libxdp 1.2.8, which are provided by meta-intel,
it doesn't work.  I tried the latest version libbpf 1.3.0 and libxdp
1.4.2 and unfortunately It still doesn't work
The output changed a little:
libbpf: prog 'xdp_dispatcher': failed to load: -22
libbpf: failed to load object 'xdp-dispatcher.o'
libxdp: Failed to load dispatcher: Invalid argument
libxdp: Falling back to loading single prog without dispatcher
libbpf: elf: skipping unrecognized data section(7) xdp_metadata
libbpf: prog 'xdp_dispatcher': BPF program load failed: Invalid argument
libbpf: prog 'xdp_dispatcher': -- BEGIN PROG LOAD LOG --
Validating prog0() func#1...
btf_vmlinux is malformed
Arg#0 type PTR in prog0() is not supported yet.

> then make sure that xdp and kernel match.

Where can I find that match table between xdp and kernel?

Thanks a lot!

Ciao,
Alessio