netdev - Re: [PATCH v10 bpf-next] bpf/selftests: fold test_current_pid_tgid_new_ns into test

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Date:   Thu, 24 Dec 2020 14:39:40 -0300
From:   Carlos Antonio Neira Bustos <cneirabustos@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Networking <netdev@...r.kernel.org>,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v10 bpf-next] bpf/selftests: fold
 test_current_pid_tgid_new_ns into test_progs.

On Tue, Dec 22, 2020 at 12:26:04PM -0800, Andrii Nakryiko wrote:
> On Mon, Dec 21, 2020 at 2:25 PM Carlos Neira <cneirabustos@...il.com> wrote:
> >
> > Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs.
> > This change folds test cases into test_progs.
> >
> > Changes from v9:
> >
> >  - Added test in root namespace.
> >  - Fixed changed tracepoint from sys_enter to sys_usleep.
> >  - Fixed pid, tgid values were inverted.
> >  - Used CLONE(2) for namespaced test, the new process pid will be 1.
> >  - Used ASSERTEQ on pid/tgid validation.
> >  - Added comment on CLONE(2) call
> >
> > Signed-off-by: Carlos Neira <cneirabustos@...il.com>
> > ---

Andrii,

Thanks for taking the time to check this out.


For the code style issues I found out that I was not using the --strict flag for
checkpatch.pl so I missed those warnings, now I'm using--strict as default. 
I should look into using cindent or clang-format to avoid this.

> 
> See checkpatch.pl errors ([0]), ignore the "do not initialize globals
> with zero" ones. Next time, please don't wait for me to point out
> every single instance where you didn't align wrapped around
> parameters.
> 
>   [0] https://patchwork.hopto.org/static/nipa/405025/11985347/checkpatch/stdout
> 
> >  tools/testing/selftests/bpf/.gitignore        |   1 -
> >  tools/testing/selftests/bpf/Makefile          |   3 +-
> >  .../bpf/prog_tests/ns_current_pid_tgid.c      | 149 ++++++++++------
> >  .../bpf/progs/test_ns_current_pid_tgid.c      |  29 ++--
> >  .../bpf/test_current_pid_tgid_new_ns.c        | 160 ------------------
> >  5 files changed, 106 insertions(+), 236 deletions(-)
> >  delete mode 100644 tools/testing/selftests/bpf/test_current_pid_tgid_new_ns.c
> >

You are right, the code is redundant I'll reuse it.
> newns_pidtgid and test_ns_current_pid_tgid_global_ns look identical to
> me, am I missing something on why you didn't reuse the testing logic
> between the two?
> 
> > +{
> > +       struct test_ns_current_pid_tgid__bss  *bss;
> > +       int err = 0, duration = 0;
> > +       struct test_ns_current_pid_tgid *skel;
> > +       pid_t pid, tgid;
> > +       struct stat st;
> >
> 
> [...]