Subject: Re: [PATCH v5] bpf/selftests: fold test_current_pid_tgid_new_ns into test_progs.

From: Carlos Antonio Neira Bustos <[email-masked]>
Date: Thu, 20 Aug 2020 10:14:20 -0400

On Tue, Aug 18, 2020 at 05:41:57PM -0700, Andrii Nakryiko wrote:
> On Tue, Aug 18, 2020 at 1:44 PM Carlos Neira <[email-masked]> wrote:
> >
> > Currently tests for bpf_get_ns_current_pid_tgid() are outside test_progs.
> > This change folds a test case into test_progs.
> >
> > Changes from V4:
> >  - Added accidentally removed blank space in Makefile.
> >  - Added () around bit-shift operations.
> >  - Fixed not valid C89 standard-compliant code.
> >
> > Signed-off-by: Carlos Neira <[email-masked]>
> > Acked-by: Andrii Nakryiko <[email-masked]>
> > ---
> >  tools/testing/selftests/bpf/.gitignore        |   2 +-
> >  tools/testing/selftests/bpf/Makefile          |   2 +-
> >  .../bpf/prog_tests/ns_current_pid_tgid.c      |  85 ----------
> >  .../bpf/prog_tests/ns_current_pidtgid.c       |  55 ++++++
> >  .../bpf/progs/test_ns_current_pid_tgid.c      |  37 ----
> >  .../bpf/progs/test_ns_current_pidtgid.c       |  25 +++
> >  .../bpf/test_current_pid_tgid_new_ns.c        | 159 ------------------
> >  .../bpf/test_ns_current_pidtgid_newns.c       |  91 ++++++++++
> >  8 files changed, 173 insertions(+), 283 deletions(-)
> >  delete mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c
> >  create mode 100644 tools/testing/selftests/bpf/prog_tests/ns_current_pidtgid.c
> >  delete mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c
> >  create mode 100644 tools/testing/selftests/bpf/progs/test_ns_current_pidtgid.c
> >  delete mode 100644 tools/testing/selftests/bpf/test_current_pid_tgid_new_ns.c
> >  create mode 100644 tools/testing/selftests/bpf/test_ns_current_pidtgid_newns.c
> >
> > diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> > index 1bb204cee853..022055f23592 100644
> > --- a/tools/testing/selftests/bpf/.gitignore
> > +++ b/tools/testing/selftests/bpf/.gitignore
> > @@ -30,8 +30,8 @@ test_tcpnotify_user
> >  test_libbpf
> >  test_tcp_check_syncookie_user
> >  test_sysctl
> > -test_current_pid_tgid_new_ns
> >  xdping
> > +test_ns_current_pidtgid_newns
> >  test_cpp
> >  *.skel.h
> >  /no_alu32
> > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > index e7a8cf83ba48..e308cc7c8598 100644
> > --- a/tools/testing/selftests/bpf/Makefile
> > +++ b/tools/testing/selftests/bpf/Makefile
> > @@ -37,7 +37,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
> >         test_cgroup_storage \
> >         test_netcnt test_tcpnotify_user test_sock_fields test_sysctl \
> >         test_progs-no_alu32 \
> > -       test_current_pid_tgid_new_ns
> > +       test_ns_current_pidtgid_newns
> 
> Have you tried doing a parallel build with make -j$(nproc) or
> something like that? It fails for me:
> 
> test_ns_current_pidtgid_newns.c:6:10: fatal error:
> test_ns_current_pidtgid.skel.h: No such file or directory
> 
>  #include "test_ns_current_pidtgid.skel.h"
> 
>           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The problem seems to be that you haven't recorded dependency on the
> skeleton file for this new test_ns_current_pidtgid_newns.
> 
> But rather than fixing it, let's just fold
> test_ns_current_pidtgid_newns into test_progs as well? Then all such
> issues will be handled automatically and this test will be executed
> regularly.
> 
> >
> >  # Also test bpf-gcc, if present
> >  ifneq ($(BPF_GCC),)
> 
> [...]

Hi Andrii,

You are right, really all tests should be folded into test_progs.
I'll fold both tests into test_progs in my next version.
Thank you for your feedback.

Bests