linux-kernel - Re: [PATCH bpf-next] selftests/bpf: Fix undeclared identifier build errors of test_bpf

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Message-ID: <14e0f634f084d0f07e447638c490da60943507d6.camel@gmail.com>
Date:   Mon, 16 Jan 2023 14:30:13 +0200
From:   Eduard Zingerman <eddyz87@...il.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] selftests/bpf: Fix undeclared identifier build
 errors of test_bpf_nf.c

On Mon, 2023-01-16 at 12:55 +0800, Tiezhu Yang wrote:
> $ make -C tools/testing/selftests/bpf/
> 
>   CLNG-BPF [test_maps] test_bpf_nf.bpf.o
> progs/test_bpf_nf.c:160:42: error: use of undeclared identifier 'NF_NAT_MANIP_SRC'
>                 bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
>                                                        ^
> progs/test_bpf_nf.c:163:42: error: use of undeclared identifier 'NF_NAT_MANIP_DST'
>                 bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
>                                                        ^
> 2 errors generated.
> 
> Copy the definitions in include/net/netfilter/nf_nat.h to test_bpf_nf.c
> to fix the above build errors.
> 
> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> index 227e85e..114f961 100644
> --- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> +++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> @@ -34,6 +34,11 @@ __be16 dport = 0;
>  int test_exist_lookup = -ENOENT;
>  u32 test_exist_lookup_mark = 0;
>  
> +enum nf_nat_manip_type {
> +	NF_NAT_MANIP_SRC,
> +	NF_NAT_MANIP_DST
> +};
> +

This is confusing, when I build the kernel/tests I get the declaration of
the "enum nf_nat_manip_type" from the vmlinux.h (which is included from test_bpf_nf.c).
Which means that this patch results in compilation error with my configuration.
Is there a chance that your kernel is configured without some necessary netfilter
configuration options? Have you tried this patch with BPF CI?

>  struct nf_conn;
>  
>  struct bpf_ct_opts___local {