netdev - [PATCH bpf-next v3 07/10] selftests/bpf: Parametrize test_xdp_context

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Message-Id: <20250721-skb-metadata-thru-dynptr-v3-7-e92be5534174@cloudflare.com>
Date: Mon, 21 Jul 2025 12:52:45 +0200
From: Jakub Sitnicki <jakub@...udflare.com>
To: bpf@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>, 
 Andrii Nakryiko <andrii@...nel.org>, Arthur Fabre <arthur@...hurfabre.com>, 
 Daniel Borkmann <daniel@...earbox.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, 
 Jesse Brandeburg <jbrandeburg@...udflare.com>, 
 Joanne Koong <joannelkoong@...il.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Toke Høiland-Jørgensen <thoiland@...hat.com>, 
 Yan Zhai <yan@...udflare.com>, kernel-team@...udflare.com, 
 netdev@...r.kernel.org, Jakub Sitnicki <jakub@...udflare.com>, 
 Stanislav Fomichev <sdf@...ichev.me>
Subject: [PATCH bpf-next v3 07/10] selftests/bpf: Parametrize
 test_xdp_context_tuntap

We want to add more test cases to cover different ways to access the
metadata area. Prepare for it. Pull up the skeleton management.

Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
---
 .../bpf/prog_tests/xdp_context_test_run.c          | 31 +++++++++++++++-------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
index 0134651d94ab..6c66e27e5bc7 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c
@@ -256,12 +256,13 @@ void test_xdp_context_veth(void)
 	netns_free(tx_ns);
 }
 
-void test_xdp_context_tuntap(void)
+static void test_tuntap(struct bpf_program *xdp_prog,
+			struct bpf_program *tc_prog,
+			struct bpf_map *result_map)
 {
 	LIBBPF_OPTS(bpf_tc_hook, tc_hook, .attach_point = BPF_TC_INGRESS);
 	LIBBPF_OPTS(bpf_tc_opts, tc_opts, .handle = 1, .priority = 1);
 	struct netns_obj *ns = NULL;
-	struct test_xdp_meta *skel = NULL;
 	__u8 packet[sizeof(struct ethhdr) + TEST_PAYLOAD_LEN];
 	int tap_fd = -1;
 	int tap_ifindex;
@@ -277,10 +278,6 @@ void test_xdp_context_tuntap(void)
 
 	SYS(close, "ip link set dev " TAP_NAME " up");
 
-	skel = test_xdp_meta__open_and_load();
-	if (!ASSERT_OK_PTR(skel, "open and load skeleton"))
-		goto close;
-
 	tap_ifindex = if_nametoindex(TAP_NAME);
 	if (!ASSERT_GE(tap_ifindex, 0, "if_nametoindex"))
 		goto close;
@@ -290,12 +287,12 @@ void test_xdp_context_tuntap(void)
 	if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
 		goto close;
 
-	tc_opts.prog_fd = bpf_program__fd(skel->progs.ing_cls);
+	tc_opts.prog_fd = bpf_program__fd(tc_prog);
 	ret = bpf_tc_attach(&tc_hook, &tc_opts);
 	if (!ASSERT_OK(ret, "bpf_tc_attach"))
 		goto close;
 
-	ret = bpf_xdp_attach(tap_ifindex, bpf_program__fd(skel->progs.ing_xdp),
+	ret = bpf_xdp_attach(tap_ifindex, bpf_program__fd(xdp_prog),
 			     0, NULL);
 	if (!ASSERT_GE(ret, 0, "bpf_xdp_attach"))
 		goto close;
@@ -312,11 +309,25 @@ void test_xdp_context_tuntap(void)
 	if (!ASSERT_EQ(ret, sizeof(packet), "write packet"))
 		goto close;
 
-	assert_test_result(skel->maps.test_result);
+	assert_test_result(result_map);
 
 close:
 	if (tap_fd >= 0)
 		close(tap_fd);
-	test_xdp_meta__destroy(skel);
 	netns_free(ns);
 }
+
+void test_xdp_context_tuntap(void)
+{
+	struct test_xdp_meta *skel = NULL;
+
+	skel = test_xdp_meta__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "open and load skeleton"))
+		return;
+
+	if (test__start_subtest("data_meta"))
+		test_tuntap(skel->progs.ing_xdp, skel->progs.ing_cls,
+			    skel->maps.test_result);
+
+	test_xdp_meta__destroy(skel);
+}

-- 
2.43.0