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selftest/bpf: Test pinning map with reused map fd

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This add a test to make sure that we can still pin maps with
reused map fd.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20201006021345.3817033-4-liuhangbin@gmail.com
This commit is contained in:
Hangbin Liu 2020-10-06 10:13:45 +08:00 committed by Alexei Starovoitov
parent 2c193d32ca
commit 44c4aa2bd1
1 changed files with 48 additions and 1 deletions
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49
tools/testing/selftests/bpf/prog_tests/pinning.c
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@ -37,7 +37,7 @@ void test_pinning(void)
struct stat statbuf = {};
struct bpf_object *obj;
struct bpf_map *map;
int err;
int err, map_fd;
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
.pin_root_path = custpath,
);
@ -213,6 +213,53 @@ void test_pinning(void)
if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
goto out;
/* remove the custom pin path to re-test it with reuse fd below */
err = unlink(custpinpath);
if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
goto out;
err = rmdir(custpath);
if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
goto out;
bpf_object__close(obj);
/* test pinning at custom path with reuse fd */
obj = bpf_object__open_file(file, NULL);
err = libbpf_get_error(obj);
if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
obj = NULL;
goto out;
}
map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(__u32),
sizeof(__u64), 1, 0);
if (CHECK(map_fd < 0, "create pinmap manually", "fd %d\n", map_fd))
goto out;
map = bpf_object__find_map_by_name(obj, "pinmap");
if (CHECK(!map, "find map", "NULL map"))
goto close_map_fd;
err = bpf_map__reuse_fd(map, map_fd);
if (CHECK(err, "reuse pinmap fd", "err %d errno %d\n", err, errno))
goto close_map_fd;
err = bpf_map__set_pin_path(map, custpinpath);
if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
goto close_map_fd;
err = bpf_object__load(obj);
if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
goto close_map_fd;
/* check that pinmap was pinned at the custom path */
err = stat(custpinpath, &statbuf);
if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
goto close_map_fd;
close_map_fd:
close(map_fd);
out:
unlink(pinpath);
unlink(nopinpath);