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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
This commit is contained in:
Toke Høiland-Jørgensen 2019-11-02 12:09:42 +01:00 committed by Alexei Starovoitov
parent 57a00f4164
commit 2f4a32cc83
3 changed files with 257 additions and 0 deletions
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210
tools/testing/selftests/bpf/prog_tests/pinning.c Normal file
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// 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);
}

31
tools/testing/selftests/bpf/progs/test_pinning.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include "bpf_helpers.h"
int _version SEC("version") = 1;
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
__uint(pinning, LIBBPF_PIN_BY_NAME);
} pinmap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
} nopinmap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
__uint(pinning, LIBBPF_PIN_NONE);
} nopinmap2 SEC(".maps");
char _license[] SEC("license") = "GPL";

16
tools/testing/selftests/bpf/progs/test_pinning_invalid.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include "bpf_helpers.h"
int _version SEC("version") = 1;
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
__uint(pinning, 2); /* invalid */
} nopinmap3 SEC(".maps");
char _license[] SEC("license") = "GPL";