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authorToke Høiland-Jørgensen <toke@redhat.com>2019-11-02 12:09:42 +0100
committerAlexei Starovoitov <ast@kernel.org>2019-11-02 20:35:07 +0100
commit2f4a32cc83a584ac3669d44fa2aa1d7f115d44c1 (patch)
tree8f65a718732bf3935e040a7c745b83ca70362ca3 /tools/testing/selftests/bpf/prog_tests/pinning.c
parentlibbpf: Add auto-pinning of maps when loading BPF objects (diff)
downloadlinux-2f4a32cc83a584ac3669d44fa2aa1d7f115d44c1.tar.xz
linux-2f4a32cc83a584ac3669d44fa2aa1d7f115d44c1.zip
selftests: Add tests for automatic map pinning
This adds a new BPF selftest to exercise the new automatic map pinning code. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/157269298209.394725.15420085139296213182.stgit@toke.dk
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/pinning.c')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/pinning.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/pinning.c b/tools/testing/selftests/bpf/prog_tests/pinning.c
new file mode 100644
index 000000000000..525388971e08
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/pinning.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <test_progs.h>
+
+__u32 get_map_id(struct bpf_object *obj, const char *name)
+{
+ struct bpf_map_info map_info = {};
+ __u32 map_info_len, duration = 0;
+ struct bpf_map *map;
+ int err;
+
+ map_info_len = sizeof(map_info);
+
+ map = bpf_object__find_map_by_name(obj, name);
+ if (CHECK(!map, "find map", "NULL map"))
+ return 0;
+
+ err = bpf_obj_get_info_by_fd(bpf_map__fd(map),
+ &map_info, &map_info_len);
+ CHECK(err, "get map info", "err %d errno %d", err, errno);
+ return map_info.id;
+}
+
+void test_pinning(void)
+{
+ const char *file_invalid = "./test_pinning_invalid.o";
+ const char *custpinpath = "/sys/fs/bpf/custom/pinmap";
+ const char *nopinpath = "/sys/fs/bpf/nopinmap";
+ const char *nopinpath2 = "/sys/fs/bpf/nopinmap2";
+ const char *custpath = "/sys/fs/bpf/custom";
+ const char *pinpath = "/sys/fs/bpf/pinmap";
+ const char *file = "./test_pinning.o";
+ __u32 map_id, map_id2, duration = 0;
+ struct stat statbuf = {};
+ struct bpf_object *obj;
+ struct bpf_map *map;
+ int err;
+ DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
+ .pin_root_path = custpath,
+ );
+
+ /* check that opening fails with invalid pinning value in map def */
+ obj = bpf_object__open_file(file_invalid, NULL);
+ err = libbpf_get_error(obj);
+ if (CHECK(err != -EINVAL, "invalid open", "err %d errno %d\n", err, errno)) {
+ obj = NULL;
+ goto out;
+ }
+
+ /* open the valid object file */
+ 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;
+ }
+
+ err = bpf_object__load(obj);
+ if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* check that pinmap was pinned */
+ err = stat(pinpath, &statbuf);
+ if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* check that nopinmap was *not* pinned */
+ err = stat(nopinpath, &statbuf);
+ if (CHECK(!err || errno != ENOENT, "stat nopinpath",
+ "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* check that nopinmap2 was *not* pinned */
+ err = stat(nopinpath2, &statbuf);
+ if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
+ "err %d errno %d\n", err, errno))
+ goto out;
+
+ map_id = get_map_id(obj, "pinmap");
+ if (!map_id)
+ goto out;
+
+ bpf_object__close(obj);
+
+ obj = bpf_object__open_file(file, NULL);
+ if (CHECK_FAIL(libbpf_get_error(obj))) {
+ obj = NULL;
+ goto out;
+ }
+
+ err = bpf_object__load(obj);
+ if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* check that same map ID was reused for second load */
+ map_id2 = get_map_id(obj, "pinmap");
+ if (CHECK(map_id != map_id2, "check reuse",
+ "err %d errno %d id %d id2 %d\n", err, errno, map_id, map_id2))
+ goto out;
+
+ /* should be no-op to re-pin same map */
+ map = bpf_object__find_map_by_name(obj, "pinmap");
+ if (CHECK(!map, "find map", "NULL map"))
+ goto out;
+
+ err = bpf_map__pin(map, NULL);
+ if (CHECK(err, "re-pin map", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* but error to pin at different location */
+ err = bpf_map__pin(map, "/sys/fs/bpf/other");
+ if (CHECK(!err, "pin map different", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* unpin maps with a pin_path set */
+ err = bpf_object__unpin_maps(obj, NULL);
+ if (CHECK(err, "unpin maps", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* and re-pin them... */
+ err = bpf_object__pin_maps(obj, NULL);
+ if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* set pinning path of other map and re-pin all */
+ map = bpf_object__find_map_by_name(obj, "nopinmap");
+ if (CHECK(!map, "find map", "NULL map"))
+ goto out;
+
+ err = bpf_map__set_pin_path(map, custpinpath);
+ if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* should only pin the one unpinned map */
+ err = bpf_object__pin_maps(obj, NULL);
+ if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* check that nopinmap was pinned at the custom path */
+ err = stat(custpinpath, &statbuf);
+ if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* remove the custom pin path to re-test it with auto-pinning 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);
+
+ /* open the valid object file again */
+ 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;
+ }
+
+ /* swap pin paths of the two maps */
+ bpf_object__for_each_map(map, obj) {
+ if (!strcmp(bpf_map__name(map), "nopinmap"))
+ err = bpf_map__set_pin_path(map, pinpath);
+ else if (!strcmp(bpf_map__name(map), "pinmap"))
+ err = bpf_map__set_pin_path(map, NULL);
+ else
+ continue;
+
+ if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
+ goto out;
+ }
+
+ /* should fail because of map parameter mismatch */
+ err = bpf_object__load(obj);
+ if (CHECK(err != -EINVAL, "param mismatch load", "err %d errno %d\n", err, errno))
+ goto out;
+
+ bpf_object__close(obj);
+
+ /* test auto-pinning at custom path with open opt */
+ obj = bpf_object__open_file(file, &opts);
+ if (CHECK_FAIL(libbpf_get_error(obj))) {
+ obj = NULL;
+ goto out;
+ }
+
+ err = bpf_object__load(obj);
+ if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
+ goto out;
+
+ /* 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 out;
+
+out:
+ unlink(pinpath);
+ unlink(nopinpath);
+ unlink(nopinpath2);
+ unlink(custpinpath);
+ rmdir(custpath);
+ if (obj)
+ bpf_object__close(obj);
+}