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Sat, 19 Sep 2026 04:01:29 -0700 (PDT) From: bestswngs@gmail.com To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org Cc: martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, davem@davemloft.net, kuba@kernel.org, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, xmei5@asu.edu, co+ac0a8c41de69121d@bugs.sh, Weiming Shi Subject: [PATCH bpf v2 2/2] selftests: net: test cross-device XDP dev-bound attachment Date: Sat, 19 Sep 2026 19:00:54 +0800 Message-ID: <20260919110053.497301-3-bestswngs@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260919110053.497301-2-bestswngs@gmail.com> References: <20260917161335.1020405-2-bestswngs@gmail.com> <20260919110053.497301-2-bestswngs@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Weiming Shi Add a regression test which loads dev-bound-only XDP programs on both ends of a veth pair. Verify that attaching one program to the other device is rejected with the expected extack. The second program keeps a bound-only registration for the target device, recreating the NULL-offdev collision fixed by the previous patch. Link: https://lore.kernel.org/bpf/20260917161335.1020405-2-bestswngs@gmail.com/ Assisted-by: LLM Signed-off-by: Weiming Shi --- Changes in v2: - New patch. tools/testing/selftests/net/bpf_offload.py | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tools/testing/selftests/net/bpf_offload.py b/tools/testing/selftests/net/bpf_offload.py index c856d266c..017910b4d 100755 --- a/tools/testing/selftests/net/bpf_offload.py +++ b/tools/testing/selftests/net/bpf_offload.py @@ -995,6 +995,24 @@ try: rm("/sys/fs/bpf/devbound") sim.wait_for_flush() + start_test("Test dev-bound program on a different device...") + cmd("ip link add bpfveth0 type veth peer name bpfveth1") + try: + bpftool_prog_load("sample_ret0.bpf.o", "/sys/fs/bpf/devbound0", + dev_bind="bpfveth0") + bpftool_prog_load("sample_ret0.bpf.o", "/sys/fs/bpf/devbound1", + dev_bind="bpfveth1") + ret, _, err = ip("link set dev bpfveth1 xdpdrv " + + bpf_pinned("/sys/fs/bpf/devbound0"), fail=False, + include_stderr=True) + fail(ret == 0, "dev-bound program attached to a different device") + check_extack(err, "Program bound to different device.", args) + finally: + cmd("ip link del bpfveth0", fail=False) + rm("/sys/fs/bpf/devbound0") + rm("/sys/fs/bpf/devbound1") + bpftool_prog_list_wait(expected=0) + start_test("Test XDP load failure...") sim.dfs["dev/bpf_bind_verifier_accept"] = 0 ret, _, err = bpftool_prog_load("sample_ret0.bpf.o", "/sys/fs/bpf/offload", -- 2.55.0