netdev - Re: [PATCH bpf-next v2] selftests/bpf: convert test_xdp_features.sh to test

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Message-ID: <b4b2f589-19fd-4d22-abb7-545c7121fbba@bootlin.com>
Date: Thu, 26 Sep 2024 12:14:58 +0200
From: Alexis Lothoré <alexis.lothore@...tlin.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>,
 Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Jakub Kicinski <kuba@...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@...ichev.me>, 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>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Maxime Chevallier <maxime.chevallier@...tlin.com>, ebpf@...uxfoundation.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v2] selftests/bpf: convert test_xdp_features.sh
 to test_progs

Hi Martin,

On 9/25/24 22:01, Martin KaFai Lau wrote:
> On 9/25/24 3:37 AM, Martin KaFai Lau wrote:
>> I am not sure which case in xdp_features.c does not have existing coverage in
>> test_progs. From a quick look, it seems only BPF_MAP_TYPE_CPUMAP is missing
>> (please check)?
> 
> Re: CPUMAP, I noticed there is a xdp_(cpu)map_attach.c test but it only does
> attach test. May be something similar can be done like
> https://lore.kernel.org/bpf/20240911-devel-koalo-fix-ingress-ifindex-v4-2-5c643ae10258@linutronix.de/ to exercise the xdp prog that does cpumap redirect.

Thanks for the guidance, I was not aware of the possibility to perform those
tests with BPF_PROG_RUN.
Indeed, the basic return values from XDP programs seem to be covered with this
method in other tests under prog_tests. For BPF_MAP_TYPE_CPUMAP, I can check and
try to apply the same logic as the series in progress you have pointed.

Once done, test_xdp_features.sh could be let as-is. Let me know if we should
stillmove it elsewhere instead of keeping it in selftests
(tools/bpf/xdp_features/ maybe ?)

And noted for the most relevant tests to convert after that, thanks :)

Alexis

-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com