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

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Message-ID: <20240914063828.7bd73c5e@kernel.org>
Date: Sat, 14 Sep 2024 06:38:28 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>, "Alexis Lothoré (eBPF Foundation)" <alexis.lothore@...tlin.com>, 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@...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

On Sat, 14 Sep 2024 11:25:47 +0200 Lorenzo Bianconi wrote:
> On Sep 13, Martin KaFai Lau wrote:
> > test a physical network device that supports a certain XDP features.
> > 
> > iiuc, test_xdp_features.sh only uses the veth and veth will also be the only
> > device tested after moving to prog_tests/xdp_features.c? It is a reasonable
> > addition to test_progs for an end-to-end xdp test by using veth. However,
> > test_progs will not be able to test the physical network device.
> > 
> > Lorenzo, is the xdp_features.c still used for device testing?
> 
> correct, xdp_features.c is intended to test the real xdp features supported by
> the NIC under test (DUT), not just the advertised ones (iirc that was a
> requisite to add xdp kernel feature support). For this reason we need two
> separated processes running on the tester device and on the DUT (they are
> usually two different devices). test_xdp_features.sh was just a simple test
> script used to develop xdp_features.c.
> What about extending xdp_features.c to integrate it in the CI?

No preference but just to raise awareness - drivers/net's NetDrvEpEnv
class provides the setup for running tests with an endpoint.
XDP tests intended for HW would fit there pretty well.