[PATCH] test/bpf: skip the BPF ELF load tests if net null missing

[Morten Brørup]

> From: Stephen Hemminger [mailto:stephen at networkplumber.org]
> Sent: Thursday, 22 January 2026 23.17
> 
> The BPF filtering tests need NULL PMD vdev to work.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

With or without suggested change,
Acked-by: Morten Brørup <mb at smartsharesystems.com>

> ---
>  app/test/test_bpf.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/app/test/test_bpf.c b/app/test/test_bpf.c
> index 0e969f9f13..78998c6194 100644
> --- a/app/test/test_bpf.c
> +++ b/app/test/test_bpf.c
> @@ -3280,7 +3280,15 @@ test_bpf(void)
> 
>  REGISTER_FAST_TEST(bpf_autotest, NOHUGE_OK, ASAN_OK, test_bpf);
> 
> -#ifdef TEST_BPF_ELF_LOAD
> +/*
> + * The BPF elf load tests needs the BPF programs to be successfully
> + * compiled into generated file bpf_test.h. This means having
> + * clang with BPF target and xxd command to encode object.
> + *
> + * Test also needs the NULL PMD to be able to have something
> + * to insert filter onto.
> + */
> +#if defined(RTE_NET_NULL) && defined(TEST_BPF_ELF_LOAD)

nit:
Consider swapping the order:
#if defined(TEST_BPF_ELF_LOAD) && defined(RTE_NET_NULL)

> 
>  /*
>   * Helper function to write BPF object data to temporary file.
> @@ -3746,11 +3754,11 @@ test_bpf_elf(void)
>  static int
>  test_bpf_elf(void)
>  {
> -	printf("BPF compile not supported, skipping test\n");
> +	printf("BPF compile or NULL PMD not supported, skipping test\n");
>  	return TEST_SKIPPED;
>  }
> 
> -#endif /* !TEST_BPF_ELF_LOAD */
> +#endif /* !(TEST_BPF_ELF_LOAD && RTE_NULL) */
> 
>  REGISTER_FAST_TEST(bpf_elf_autotest, NOHUGE_OK, ASAN_OK,
> test_bpf_elf);
> 
> --
> 2.51.0