From: Alexei Starovoitov <ast@kernel.org>

bpf_prog_type_syscall is a program that creates a bpf map,
updates it, and loads another bpf program using bpf_sys_bpf() helper.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
 tools/testing/selftests/bpf/Makefile          |  1 +
 .../selftests/bpf/prog_tests/syscall.c        | 53 ++++++++++++++
 tools/testing/selftests/bpf/progs/syscall.c   | 73 +++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/syscall.c
 create mode 100644 tools/testing/selftests/bpf/progs/syscall.c

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index c5bcdb3d4b12..9fdfdbc61857 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile

@@ -278,6 +278,7 @@ MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
 BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN)                  \
             -I$(INCLUDE_DIR) -I$(CURDIR) -I$(APIDIR)                   \
+            -I$(TOOLSINCDIR) \

             -I$(abspath $(OUTPUT)/../usr/include)

 CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \

diff --git a/tools/testing/selftests/bpf/prog_tests/syscall.c b/tools/testing/selftests/bpf/prog_tests/syscall.c
new file mode 100644
index 000000000000..e550e36bb5da
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/syscall.c

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <test_progs.h>
+#include "syscall.skel.h"
+
+struct args {
+       __u64 log_buf;
+       __u32 log_size;
+       int max_entries;
+       int map_fd;
+       int prog_fd;
+};
+
+void test_syscall(void)
+{
+       static char verifier_log[8192];
+       struct args ctx = {
+               .max_entries = 1024,
+               .log_buf = (uintptr_t) verifier_log,
+               .log_size = sizeof(verifier_log),
+       };
+       struct bpf_prog_test_run_attr tattr = {
+               .ctx_in = &ctx,
+               .ctx_size_in = sizeof(ctx),
+       };
+       struct syscall *skel = NULL;
+       __u64 key = 12, value = 0;
+       __u32 duration = 0;
+       int err;
+
+       skel = syscall__open_and_load();
+       if (CHECK(!skel, "skel_load", "syscall skeleton failed\n"))
+               goto cleanup;
+
+       tattr.prog_fd = bpf_program__fd(skel->progs.bpf_prog);
+       err = bpf_prog_test_run_xattr(&tattr);
+       if (CHECK(err || tattr.retval != 1, "test_run sys_bpf",
+                 "err %d errno %d retval %d duration %d\n",
+                 err, errno, tattr.retval, tattr.duration))
+               goto cleanup;
+
+       CHECK(ctx.map_fd <= 0, "map_fd", "fd = %d\n", ctx.map_fd);
+       CHECK(ctx.prog_fd <= 0, "prog_fd", "fd = %d\n", ctx.prog_fd);

+       CHECK(memcmp(verifier_log, "processed", sizeof("processed") - 1) != 0,
+             "verifier_log", "%s\n", verifier_log);
+
+       err = bpf_map_lookup_elem(ctx.map_fd, &key, &value);
+       CHECK(err, "map_lookup", "map_lookup failed\n");
+       CHECK(value != 34, "invalid_value",
+             "got value %llu expected %u\n", value, 34);
+cleanup:
+       syscall__destroy(skel);
+}

diff --git a/tools/testing/selftests/bpf/progs/syscall.c b/tools/testing/selftests/bpf/progs/syscall.c
new file mode 100644
index 000000000000..01476f88e45f
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/syscall.c

@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <linux/stddef.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <../../tools/include/linux/filter.h>