Re: [RESEND PATCH bpf-next v3 2/2] selftests/bpf: Add testcase for xdp attaching failure tracepoint

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On 7/20/23 8:52 AM, Leon Hwang wrote:
Add a test case for the tracepoint of xdp attaching failure by bpf
tracepoint when attach XDP to a device with invalid flags option.

The bpf tracepoint retrieves error message from the tracepoint, and
then put the error message to a perf buffer. The testing code receives
error message from perf buffer, and then ASSERT "Invalid XDP flags for
BPF link attachment".

Signed-off-by: Leon Hwang <hffilwlqm@xxxxxxxxx>
---
  .../selftests/bpf/prog_tests/xdp_attach.c     | 65 +++++++++++++++++++
  .../bpf/progs/test_xdp_attach_fail.c          | 52 +++++++++++++++
  2 files changed, 117 insertions(+)
  create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_attach_fail.c

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
index fa3cac5488f5d..99f8d03f3c8bd 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_attach.c
@@ -1,5 +1,6 @@
  // SPDX-License-Identifier: GPL-2.0
  #include <test_progs.h>
+#include "test_xdp_attach_fail.skel.h"
#define IFINDEX_LO 1
  #define XDP_FLAGS_REPLACE		(1U << 4)
@@ -85,10 +86,74 @@ static void test_xdp_attach(const char *file)
  	bpf_object__close(obj1);
  }
+struct xdp_errmsg {
+	char msg[64];
+};
+
+static void on_xdp_errmsg(void *ctx, int cpu, void *data, __u32 size)
+{
+	struct xdp_errmsg *ctx_errmg = ctx, *tp_errmsg = data;
+
+	memcpy(&ctx_errmg->msg, &tp_errmsg->msg, size);
+}
+
+static const char tgt_errmsg[] = "Invalid XDP flags for BPF link attachment";
+
+static void test_xdp_attach_fail(const char *file)

The test crashed: https://github.com/kernel-patches/bpf/actions/runs/5672753995/job/15373384795#step:6:8037

Please monitor the CI test result in the future.

+{
+	__u32 duration = 0;
+	int err, fd_xdp, fd_link_xdp;
+	struct bpf_object *obj = NULL;
+	struct test_xdp_attach_fail *skel = NULL;
+	struct bpf_link *link = NULL;
+	struct perf_buffer *pb = NULL;
+	struct xdp_errmsg errmsg = {};
+
+	LIBBPF_OPTS(bpf_link_create_opts, opts);
+
+	skel = test_xdp_attach_fail__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "test_xdp_attach_fail_skel"))
+		goto out_close;
+
+	link = bpf_program__attach_tracepoint(skel->progs.tp__xdp__bpf_xdp_link_attach_failed,
+					      "xdp", "bpf_xdp_link_attach_failed");
+	if (!ASSERT_OK_PTR(link, "attach_tp"))
+		goto out_close;
+
+	/* set up perf buffer */
+	pb = perf_buffer__new(bpf_map__fd(skel->maps.xdp_errmsg_pb), 1,
+			      on_xdp_errmsg, NULL, &errmsg, NULL);
+
+	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &fd_xdp);
+	if (CHECK_FAIL(err))
+		goto out_close;
+
+	opts.flags = 0xFF; // invalid flags to fail to attach XDP prog
+	fd_link_xdp = bpf_link_create(fd_xdp, IFINDEX_LO, BPF_XDP, &opts);
+	if (CHECK(fd_link_xdp != -22, "bpf_link_create_failed",

Please stay with the ASSERT_* macro.

--
pw-bot: cr






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