Re: [PATCH mptcp-next] Squash to "selftests/bpf: Add mptcp subflow subtest"

[Geliang Tang <geliang@kernel.org>]

Hi Matt,

On Fri, 2024-07-26 at 11:18 +0200, Matthieu Baerts wrote:
> Hi Geliang,
> 
> Thank you for the patch!
> 
> On 25/07/2024 03:58, Geliang Tang wrote:
> > From: Geliang Tang <tanggeliang@kylinos.cn>
> > 
> > Skip the test with test__skip() for systems that do not
> > support "ip mptcp", so that CI can also pass.
> > 
> > Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> > ---
> >  tools/testing/selftests/bpf/prog_tests/mptcp.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > index 00f63f3f19f4..ddef8c61360f 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> > @@ -357,10 +357,11 @@ static int endpoint_init(char *flags)
> >  	SYS(fail, "ip -net %s link set dev veth1 up", NS_TEST);
> >  	SYS(fail, "ip -net %s addr add %s/24 dev veth2", NS_TEST,
> > ADDR_2);
> >  	SYS(fail, "ip -net %s link set dev veth2 up", NS_TEST);
> > -	/* It would be better to use  "ip -net %s mptcp endpoint
> > add %s %s",
> > -	 * but the BPF CI is using an old version of IPRoute
> > (5.5.0).
> > -	 */
> > -	SYS(fail, "ip netns exec %s ./mptcp_pm_nl_ctl add %s flags
> > %s", NS_TEST, ADDR_2, flags);
> > +	if (SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s",
> > NS_TEST, ADDR_2, flags)) {
> 
> This will silently mark the test as skipped, because stderr will be
> muted.
> 
> > +		/* "ip mptcp" not support, skip this test. */
> 
> Could it be possible to at least print this comment? I can add:
> 
>   fprintf(stderr, "'ip mptcp' not supported, skip this test.\n");
> 
> when applying the patch. WDYT?

Martin, BPF maintainer, replied on "[v3 2/3] selftests/bpf: Add mptcp
pm_nl_ctl link" recently to suggest us to send a v4 of it, if then, no
need to apply this squash-to patch at this moment. Please send a v4 to
continue using mptcp pm_nl_ctl.

Sorry for the confusion caused.

Thanks,
-Geliang

> 
> > +		test__skip();
> > +		goto fail;
> > +	}
> >  
> >  	return 0;
> >  fail:
> > @@ -435,7 +436,7 @@ static void test_subflow(void)
> >  	if (!ASSERT_OK_PTR(nstoken, "create_netns:
> > mptcp_subflow"))
> >  		goto skel_destroy;
> >  
> > -	if (!ASSERT_OK(endpoint_init("subflow"), "endpoint_init"))
> > +	if (endpoint_init("subflow"))
> >  		goto close_netns;
> >  
> >  	run_subflow(skel->data->cc);
> 
> Cheers,
> Matt