netdev - Re: [PATCH bpf-next v2 3/3] samples: bpf: refactor XDP kern program maps with BTF-defined map

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Date:   Sat, 10 Oct 2020 16:56:00 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     "Daniel T. Lee" <danieltimlee@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Xdp <xdp-newbies@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 3/3] samples: bpf: refactor XDP kern program
 maps with BTF-defined map

On Sat, Oct 10, 2020 at 11:17 AM Daniel T. Lee <danieltimlee@...il.com> wrote:
>
> Most of the samples were converted to use the new BTF-defined MAP as
> they moved to libbpf, but some of the samples were missing.
>
> Instead of using the previous BPF MAP definition, this commit refactors
> xdp_monitor and xdp_sample_pkts_kern MAP definition with the new
> BTF-defined MAP format.
>
> Also, this commit removes the max_entries attribute at PERF_EVENT_ARRAY
> map type. The libbpf's bpf_object__create_map() will automatically
> set max_entries to the maximum configured number of CPUs on the host.
>
> Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
>
> ---
> Changes in v2:
>  - revert BTF key/val type to default of BPF_MAP_TYPE_PERF_EVENT_ARRAY
>

Acked-by: Andrii Nakryiko <andrii@...nel.org>


>  samples/bpf/xdp_monitor_kern.c     | 60 +++++++++++++++---------------
>  samples/bpf/xdp_sample_pkts_kern.c | 14 +++----
>  samples/bpf/xdp_sample_pkts_user.c |  1 -
>  3 files changed, 36 insertions(+), 39 deletions(-)
>

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