[PATCH bpf-next v2 5/5] bpf/selftests: add simple selftest for bpf_smc_ops

["D. Wythe" <alibuda@linux.alibaba.com>]

This PATCH adds a tiny selftest for bpf_smc_ops, to verify the ability
to load and attach.

Follow the steps below to run this test.

make -C tools/testing/selftests/bpf
cd tools/testing/selftests/bpf
sudo ./test_progs -t smc

Results shows:
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
---
 tools/testing/selftests/bpf/config            |  3 +++
 .../selftests/bpf/prog_tests/test_bpf_smc.c   | 25 +++++++++++++++++
 tools/testing/selftests/bpf/progs/bpf_smc.c   | 27 +++++++++++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/test_bpf_smc.c
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_smc.c

diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config
index c378d5d07e02..99f1cf10475f 100644
--- a/tools/testing/selftests/bpf/config
+++ b/tools/testing/selftests/bpf/config
@@ -113,3 +113,6 @@ CONFIG_XDP_SOCKETS=y
 CONFIG_XFRM_INTERFACE=y
 CONFIG_TCP_CONG_DCTCP=y
 CONFIG_TCP_CONG_BBR=y
+CONFIG_INFINIBAND=m
+CONFIG_SMC=m
+CONFIG_SMC_OPS=y
\ No newline at end of file
diff --git a/tools/testing/selftests/bpf/prog_tests/test_bpf_smc.c b/tools/testing/selftests/bpf/prog_tests/test_bpf_smc.c
new file mode 100644
index 000000000000..b24da7e8db66
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/test_bpf_smc.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+#include "bpf_smc.skel.h"
+
+static void load(void)
+{
+	struct bpf_smc *skel;
+	int ret;
+
+	skel = bpf_smc__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "bpf_smc__open_and_load"))
+		return;
+
+	ret = bpf_smc__attach(skel);
+	ASSERT_EQ(ret, 0, "bpf_smc__attach");
+
+	bpf_smc__destroy(skel);
+}
+
+void test_bpf_smc(void)
+{
+	if (test__start_subtest("load"))
+		load();
+}
diff --git a/tools/testing/selftests/bpf/progs/bpf_smc.c b/tools/testing/selftests/bpf/progs/bpf_smc.c
new file mode 100644
index 000000000000..32d15596f209
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_smc.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+SEC("struct_ops/bpf_smc_set_tcp_option_cond")
+int BPF_PROG(bpf_smc_set_tcp_option_cond, const struct tcp_sock *tp, struct inet_request_sock *ireq)
+{
+	return 0;
+}
+
+SEC("struct_ops/bpf_smc_set_tcp_option")
+int BPF_PROG(bpf_smc_set_tcp_option, struct tcp_sock *tp)
+{
+	return 1;
+}
+
+SEC(".struct_ops.link")
+struct smc_ops  sample_smc_ops = {
+	.name			= "sample",
+	.set_option		= (void *) bpf_smc_set_tcp_option,
+	.set_option_cond	= (void *) bpf_smc_set_tcp_option_cond,
+};
-- 
2.45.0