netdev - Re: [PATCH v1 bpf-next 5/8] selftests/bpf: Factor out load_path and defines from test_sock

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Date: Tue, 2 Apr 2024 17:05:18 -0700
From: Jordan Rife <jrife@...gle.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: linux-kselftest@...r.kernel.org, netdev@...r.kernel.org, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	"David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, Daan De Meyer <daan.j.demeyer@...il.com>, bpf@...r.kernel.org
Subject: Re: [PATCH v1 bpf-next 5/8] selftests/bpf: Factor out load_path and
 defines from test_sock_addr

> The newer prog_tests/sock_addr.c was created when adding AF_UNIX support. It has
> a very similar setup as the older test_sock_addr.c and the intention was to
> finally retire test_sock_addr.c. e.g. It also has "load_fn loadfn" but is done
> with skeleton, the program is also attached to cgroup...etc.

Thanks, I wasn't sure what the preferred direction would be here. I
saw some discussion
in the AF_UNIX support patch series about prog_tests being the
preferred approach and
there being plans to migrate the old test_sock_addr.c tests to the new format.

I suspect the changes mentioned here (load done with skeleton, etc.)
and helpers needed
to support the tests in my patch series may also be helpful in
retiring test_sock_addr.c.

> Instead of adding a new sock_addr_kern.c in patch 7, it probably will be easier
> to add the kernel socket tests into the existing prog_tests/sock_addr.c.

Originally it felt awkward to try to merge these tests with
prog_tests/sock_addr.c, because
while the goals are similar the flow is different with
loading/unloading a kernel module to
drive socket operations. I'll revisit this and see if I can merge
everything into
prog_tests/sock_addr.c. Switching to kfuncs as mentioned earlier might
make this simpler
as well.

> Also setup the netns and veth in the prog_tests/sock_addr.c instead of calling
> out the test_sock_addr.sh (which should also go away eventually), there are
> examples in prog_tests/ (e.g. mptcp.c).

Ack. Sure thing.

-Jordan