linux-kernel - Re: [PATCH] selftests/bpf: remove ARRAY

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Date:   Wed, 15 Dec 2021 20:04:38 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests/bpf: remove ARRAY_SIZE defines from tests

On Tue, Dec 14, 2021 at 12:27 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> On 12/11/21 6:53 PM, Alexei Starovoitov wrote:
> > On Fri, Dec 10, 2021 at 9:34 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
> >>
> >> ARRAY_SIZE is defined in multiple test files. Remove the definitions
> >> and include header file for the define instead.
> >>
> >> Remove ARRAY_SIZE define and add include bpf_util.h to bring in the
> >> define.
> >>
> >> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> >> ---
> >>   tools/testing/selftests/bpf/progs/netif_receive_skb.c | 5 +----
> >>   tools/testing/selftests/bpf/progs/profiler.inc.h      | 5 +----
> >>   tools/testing/selftests/bpf/progs/test_sysctl_loop1.c | 5 +----
> >>   tools/testing/selftests/bpf/progs/test_sysctl_loop2.c | 4 +---
> >>   tools/testing/selftests/bpf/progs/test_sysctl_prog.c  | 5 +----
> >>   5 files changed, 5 insertions(+), 19 deletions(-)
> >>
> >> diff --git a/tools/testing/selftests/bpf/progs/netif_receive_skb.c b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
> >> index 1d8918dfbd3f..7a5ebd330689 100644
> >> --- a/tools/testing/selftests/bpf/progs/netif_receive_skb.c
> >> +++ b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
> >> @@ -5,6 +5,7 @@
> >>   #include <bpf/bpf_helpers.h>
> >>   #include <bpf/bpf_tracing.h>
> >>   #include <bpf/bpf_core_read.h>
> >> +#include <bpf/bpf_util.h>
> >
> > It doesn't look like you've built it.
> >
> > progs/test_sysctl_prog.c:11:10: fatal error: 'bpf/bpf_util.h' file not found
> > #include <bpf/bpf_util.h>
> >           ^~~~~~~~~~~~~~~~
> >    CLNG-BPF [test_maps] socket_cookie_prog.o
> > progs/test_sysctl_loop2.c:11:10: fatal error: 'bpf/bpf_util.h' file not found
> > #include <bpf/bpf_util.h>
> >           ^~~~~~~~~~~~~~~~
> > 1 error generated.
> > In file included from progs/profiler2.c:6:
> > progs/profiler.inc.h:7:10: fatal error: 'bpf/bpf_util.h' file not found
> > #include <bpf/bpf_util.h>
> >           ^~~~~~~~~~~~~~~~
> >
>
> Sorry about that. I built it - I think something is wrong in my env. Build
> fails complaining about not finding vmlinux - I overlooked that the failure
> happened before it got to progs.
>
> Error: failed to load BTF from .../vmlinux: No such file or directory

Please make sure that you build vmlinux before you build selftests,
BPF selftests use vmlinux to generate vmlinux.h with all kernel types
(among other things). So please also make sure that all the setting in
selftests/bpf/config were used in your Kconfig.

>
> I do have the kernel built with gcc. Is there a clang dependency?

Yes, you'll need recent enough Clang. Probably the easiest is to get
one of the latest nightly packages.

>
> thanks,
> -- Shuah
>