netdev - Re: [PATCH bpf-next 0/8] Simplify xdp_do_redirect_map()/xdp_do_flush

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Date:   Thu, 19 Dec 2019 14:56:04 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        Netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Maciej Fijalkowski <maciejromanfijalkowski@...il.com>
Subject: Re: [PATCH bpf-next 0/8] Simplify xdp_do_redirect_map()/xdp_do_flush_map()
 and XDP maps

On Thu, Dec 19, 2019 at 12:08 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 12/19/19 8:33 PM, Jesper Dangaard Brouer wrote:
> > On Wed, 18 Dec 2019 16:39:08 -0800
> > Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
> >
> >> On Wed, Dec 18, 2019 at 4:04 AM Jesper Dangaard Brouer
> >> <brouer@...hat.com> wrote:
> >>>
> >>> On Wed, 18 Dec 2019 12:39:53 +0100
> >>> Björn Töpel <bjorn.topel@...il.com> wrote:
> >>>
> >>>> On Wed, 18 Dec 2019 at 12:11, Jesper Dangaard Brouer <brouer@...hat.com> wrote:
> >>>>>
> >>>>> On Wed, 18 Dec 2019 11:53:52 +0100
> >>>>> Björn Töpel <bjorn.topel@...il.com> wrote:
> >>>>>
> >>>>>>    $ sudo ./xdp_redirect_cpu --dev enp134s0f0 --cpu 22 xdp_cpu_map0
> >>>>>>
> >>>>>>    Running XDP/eBPF prog_name:xdp_cpu_map5_lb_hash_ip_pairs
> >>>>>>    XDP-cpumap      CPU:to  pps            drop-pps    extra-info
> >>>>>>    XDP-RX          20      7723038        0           0
> >>>>>>    XDP-RX          total   7723038        0
> >>>>>>    cpumap_kthread  total   0              0           0
> >>>>>>    redirect_err    total   0              0
> >>>>>>    xdp_exception   total   0              0
> >>>>>
> >>>>> Hmm... I'm missing some counters on the kthread side.
> >>>>>
> >>>>
> >>>> Oh? Any ideas why? I just ran the upstream sample straight off.
> >>>
> >>> Looks like it happened in commit: bbaf6029c49c ("samples/bpf: Convert
> >>> XDP samples to libbpf usage") (Cc Maciej).
> >>>
> >>> The old bpf_load.c will auto attach the tracepoints... for and libbpf
> >>> you have to be explicit about it.
> >>
> >> ... or you can use skeleton, which will auto-attach them as well,
> >> provided BPF program's section names follow expected naming
> >> convention. So it might be a good idea to try it out.
> >
> > To Andrii, can you provide some more info on how to use this new
> > skeleton system of yours?  (Pointers to code examples?)
>
> There's a man page ;-)
>
> https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/tools/bpf/bpftool/Documentation/bpftool-gen.rst

Also see runqslower patch set for end-to-end set up. There are a bunch
of selftests already using skeletons (test_attach_probe,
test_core_extern, test_skeleton).