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

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Date:   Thu, 16 Dec 2021 12:03:57 -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 Thu, Dec 16, 2021 at 11:51 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> On 12/16/21 12:30 PM, Andrii Nakryiko wrote:
> > On Thu, Dec 16, 2021 at 6:42 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
> >>
> >> On 12/15/21 9:04 PM, Andrii Nakryiko wrote:
> >>> 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.
> >>>
> >>>>
> >>
> >> The problem in my env. is that I don't have CONFIG_DEBUG_INFO_BTF in
> >> my config and then don't have the dwarves and llvm-strip on my system.
> >> Pains of upgrading.
> >>
> >> I am all set now. On the other hand the vmlinux.h is a mess. It has
> >> no guards for defines and including stdio.h and this generated
> >> vmlinux.h causes all sorts of problems.
> >
> > It does have
> >
> > #ifndef __VMLINUX_H__
> > #define __VMLINUX_H__
> >
> > Are we talking about the same vmlinux.h here?
> >
>
> Yes we are. The guard it has works when vmlinux.h is included
> twice. It defines a lot of common defines which are the problem.
> Unless you add guards around each one of them, including vmlinux.h
> is problematic if you also include other standard includes.
>
> You can try to include bpf_util.h for example from one of the
> test in progs to see the problem.

bpf_util.h is a user-space header, it's not going to work from the BPF
program side. If you look at any of progs/*.c (all of which are BPF
program-side source code), not a single one is including bpf_util.h.

>
> thanks,
> -- Shuah