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Message-ID: <20240503154939.79f7c878@kernel.org>
Date: Fri, 3 May 2024 15:49:39 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, nalramli@...tly.com, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH net-next] selftest: epoll_busy_poll: epoll busy poll
 tests

On Thu,  2 May 2024 21:20:11 +0000 Joe Damato wrote:
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -84,6 +84,7 @@ TEST_GEN_FILES += sctp_hello
>  TEST_GEN_FILES += csum
>  TEST_GEN_FILES += ip_local_port_range
>  TEST_GEN_FILES += bind_wildcard
> +TEST_GEN_FILES += epoll_busy_poll

"GEN" is for files which are built for other tests to use.
IOW unless there's also a wrapper script under TEST_PROGS
(or the C code is itself under TEST_PROGS) this test won't
be executed by most CIs.

FWIW here's how we run the tests in our CI upstream CI:
https://github.com/linux-netdev/nipa/wiki/How-to-run-netdev-selftests-CI-style

>  TEST_PROGS += test_vxlan_mdb.sh
>  TEST_PROGS += test_bridge_neigh_suppress.sh
>  TEST_PROGS += test_vxlan_nolocalbypass.sh

> +static void do_simple_test(void)
> +{
> +	int fd;
> +
> +	fd = epoll_create1(0);
> +	if (fd == -1)
> +		error(1, errno, "epoll_create");
> +
> +	do_simple_test_invalid_fd();
> +	do_simple_test_invalid_ioctl(fd);
> +	do_simple_test_get_params(fd);
> +	do_simple_test_set_invalid(fd);
> +	do_simple_test_set_and_get_valid(fd);

You don't want to use the kselftest_harness for this?
No strong preference here, but seems like you could
pop the epoll_create1 into a FIXTURE() and then the
test cases into TEST_F() and we'd get the KTAP output
formatting, ability to run the tests selectively etc.
for free.

tools/testing/selftests/net/tap.c is probably a good example 
to take a look at

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