netdev - Re: [PATCH bpf-next v4 2/8] libbpf: Implement changes needed for BTFGen in bpftool

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Date:   Wed, 12 Jan 2022 18:08:42 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Mauricio Vásquez <mauricio@...volk.io>,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: Re: [PATCH bpf-next v4 2/8] libbpf: Implement changes needed for
 BTFGen in bpftool

2022-01-12 09:27 UTC-0500 ~ Mauricio Vásquez <mauricio@...volk.io>
> This commit extends libbpf with the features that are needed to
> implement BTFGen:
> 
> - Implement bpf_core_create_cand_cache() and bpf_core_free_cand_cache()
> to handle candidates cache.
> - Expose bpf_core_add_cands() and bpf_core_free_cands to handle
> candidates list.
> - Expose bpf_core_calc_relo_insn() to bpftool.
> 
> Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>
> Signed-off-by: Rafael David Tinoco <rafael.tinoco@...asec.com>
> Signed-off-by: Lorenzo Fontana <lorenzo.fontana@...stic.co>
> Signed-off-by: Leonardo Di Donato <leonardo.didonato@...stic.co>
> ---
>  tools/lib/bpf/Makefile          |  2 +-
>  tools/lib/bpf/libbpf.c          | 43 +++++++++++++++++++++------------
>  tools/lib/bpf/libbpf_internal.h | 12 +++++++++
>  3 files changed, 41 insertions(+), 16 deletions(-)
> 
> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> index f947b61b2107..dba019ee2832 100644
> --- a/tools/lib/bpf/Makefile
> +++ b/tools/lib/bpf/Makefile
> @@ -239,7 +239,7 @@ install_lib: all_cmd
>  
>  SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h	     \
>  	    bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h	     \
> -	    skel_internal.h libbpf_version.h
> +	    skel_internal.h libbpf_version.h relo_core.h libbpf_internal.h
>  GEN_HDRS := $(BPF_GENERATED)

I don't think these headers should be added to libbpf's SRC_HDRS. If we
must make them available to bpftool, we probably want to copy them
explicitly through LIBBPF_INTERNAL_HDRS in bpftool's Makefile.