Re: [PATCH bpf-next 01/10] selftests/bpf: test_tunnel: Add generic_attach* helpers

[Stanislav Fomichev <stfomichev@gmail.com>]

On 02/27, Bastien Curutchet (eBPF Foundation) wrote:
> A fair amount of code duplication is present among tests to attach BPF
> programs.
> 
> Create generic_attach* helpers that attach BPF programs to a given
> interface.
> Use ASSERT_OK_FD() instead of ASSERT_GE() to check fd's validity.
> Use these helpers in all the available tests.
> 
> Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
> ---
>  .../testing/selftests/bpf/prog_tests/test_tunnel.c | 128 ++++++++++-----------
>  1 file changed, 62 insertions(+), 66 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/test_tunnel.c b/tools/testing/selftests/bpf/prog_tests/test_tunnel.c
> index cec746e77cd3abdf561cfc2422fa0a934fc481cd..27a8c8caa87e4c6b39b2b26c2aa9860b131a70a9 100644
> --- a/tools/testing/selftests/bpf/prog_tests/test_tunnel.c
> +++ b/tools/testing/selftests/bpf/prog_tests/test_tunnel.c
> @@ -397,6 +397,56 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int igr_fd, int egr_fd)
>  	return 0;
>  }
>  
> +static int generic_attach(const char *dev, int igr_fd, int egr_fd)
> +{
> +	DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook, .attach_point = BPF_TC_INGRESS);

nit: .attach_point = BPF_TC_INGRESS is a bit confusing to me here
(because we later attach both ingress and egress progs); mostly
because the way attach_tc_prog is written I think. Can we move
tc_hook definition to attach_tc_prog and make it
.attach_point=BPF_TC_INGRESS|BPF_TC_EGRESS? And then we can make
attach_tc_prog accept ifindex instead of tc_hook.

int attach_tc_prog(int ifindex, igr_fd, egr_fd)
{
	DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook, .attach_point = BPF_TC_INGRESS|BPF_TC_EGRESS);

	bpf_tc_hook_create(&tc_hook);
	if (igr_fd >= 0) {
		tc_hook.attach_point = BPF_TC_INGRESS;
		...
	}
	if (egr_fd >= 0) {
		tc_hook.attach_point = BPF_TC_EGRESS;
		...
	}
}

Or is it just me?