netdev - Re: [PATCH bpf-next v3 0/5] skip verifier/map tests if kernel support is missing

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Date:   Thu, 31 Jan 2019 10:40:16 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org
Subject: Re: [PATCH bpf-next v3 0/5] skip verifier/map tests if kernel support
 is missing

On 01/28/2019 06:21 PM, Stanislav Fomichev wrote:
> If test_maps/test_verifier is running against the kernel which doesn't
> have _all_ BPF features enabled, it fails with an error. This patch
> series tries to probe kernel support for each failed test and skip
> it instead. This lets users run BPF selftests in the not-all-bpf-yes
> environments and received correct PASS/NON-PASS result.
> 
> See https://www.spinics.net/lists/netdev/msg539331.html for more
> context.
> 
> The series goes like this:
> 
> * patch #1 skips sockmap tests in test_maps.c if BPF_MAP_TYPE_SOCKMAP
>   map is not supported (if bpf_create_map fails, we probe the kernel
>   for support)
> * patch #2 skips verifier tests if test->prog_type is not supported (if
>   bpf_verify_program fails, we probe the kernel for support)
> * patch #3 skips verifier tests if test fixup map is not supported (if
>   create_map fails, we probe the kernel for support)
> * next patches fix various small issues that arise from the first four:
>   * patch #4 sets "unknown func bpf_trace_printk#6" prog_type to
>     BPF_PROG_TYPE_TRACEPOINT so it is correctly skipped in
>     CONFIG_BPF_EVENTS=n case
>   * patch #5 exposes BPF_PROG_TYPE_CGROUP_{SKB,SOCK,SOCK_ADDR} only when
>     CONFIG_CGROUP_BPF=y, this makes verifier correctly skip appropriate
>     tests
> 
> v3 changes:
> * rebased on top of Quentin's series which adds probes to libbpf
> 
> v2 changes:
> * don't sprinkle "ifdef CONFIG_CGROUP_BPF" all around net/core/filter.c,
>   doing it only in the bpf_types.h is enough to disable
>   BPF_PROG_TYPE_CGROUP_{SKB,SOCK,SOCK_ADDR} prog types for non-cgroup
>   enabled kernels
> 
> Stanislav Fomichev (5):
>   selftests/bpf: skip sockmap in test_maps if kernel doesn't have
>     support
>   selftests/bpf: skip verifier tests for unsupported program types
>   selftests/bpf: skip verifier tests for unsupported map types
>   selftests/bpf: mark verifier test that uses bpf_trace_printk as
>     BPF_PROG_TYPE_TRACEPOINT
>   bpf: BPF_PROG_TYPE_CGROUP_{SKB,SOCK,SOCK_ADDR} require cgroups enabled
> 
>  include/linux/bpf_types.h                     |  2 +
>  tools/testing/selftests/bpf/test_maps.c       | 13 +++++-
>  tools/testing/selftests/bpf/test_verifier.c   | 45 +++++++++++++++++--
>  tools/testing/selftests/bpf/verifier/unpriv.c |  1 +
>  4 files changed, 56 insertions(+), 5 deletions(-)
> 

Applied, thanks!