Re: xdp_iphash_to_cpu_cmdline: Error loading BTF: Invalid argument(22)

On Thu, Jun 24, 2021 at 1:45 PM Ethy H. Brito <[email protected]> wrote:
>
> On Thu, 24 Jun 2021 22:16:37 +0200
> Jesper Dangaard Brouer <[email protected]> wrote:
>
> > On Thu, 24 Jun 2021 17:04:58 -0300
> > "Ethy H. Brito" <[email protected]> wrote:
> >
> > > On Tue, 22 Jun 2021 17:22:16 -0300
> > > "Ethy"  wrote:
> > >
> > > > Hi
> > > >
> > > > Runing "# ./xdp_iphash_to_cpu --dev eth1 --all-cpus --wan" returns 2 loading errors:
> > > >
> > > > ----------------------8<----------------------------------
> > > > libbpf: Error loading BTF: Invalid argument(22)
> > > > libbpf: magic: 0xeb9f
> > > > version: 1
> > > > flags: 0x0
> > > > hdr_len: 24
> > > > type_off: 0
> > > > type_len: 492
> > > > str_off: 492
> > > > str_len: 1724
> > > > btf_total_size: 2240
> > > > [1] PTR (anon) type_id=2
> > > > [2] STRUCT xdp_md size=20 vlen=5
> > > >   data type_id=3 bits_offset=0
> > > >   data_end type_id=3 bits_offset=32
> > > >   data_meta type_id=3 bits_offset=64
> > > >   ingress_ifindex type_id=3 bits_offset=96
> > > >   rx_queue_index type_id=3 bits_offset=128
> > > > [3] TYPEDEF __u32 type_id=4
> > > > [4] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none)
> > > > [5] FUNC_PROTO (anon) return=6 args=(1 ctx)
> > > > [6] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED
> > > > [7] FUNC xdp_program type_id=5 vlen != 0
> > > >
> > > > libbpf: Error loading ELF section .BTF: -22. Ignored and continue.
> >
> > NOTICE above: "Ignored and continue".
> >
> > Thus, this is not a real *error*, instead this is just a (very) verbose
> > *warning* that your system (kernel version? / compile options?) doesn't
> > support BTF correctly.  The BTF info is not really needed by
> > xdp-cpuma-tc, so you can safely ignore this "warning".

FYI, the error is due to
    [7] FUNC xdp_program type_id=5 vlen != 0
I guess you may have an old libbpf. The new libbpf should do
sanitization for this.
  https://lore.kernel.org/bpf/[email protected]/

>
> Noticed!
>
> >
> >
> > > > TC workaround for mapname: map_ifindex_type map_fd:5
> > > > Added CPU:0 queue_size:192
> > > > Added CPU:1 queue_size:192
[...]