281 lines
7.8 KiB
C
281 lines
7.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <test_progs.h>
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__u32 get_map_id(struct bpf_object *obj, const char *name)
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{
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struct bpf_map_info map_info = {};
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__u32 map_info_len, duration = 0;
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struct bpf_map *map;
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int err;
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map_info_len = sizeof(map_info);
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map = bpf_object__find_map_by_name(obj, name);
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if (CHECK(!map, "find map", "NULL map"))
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return 0;
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err = bpf_obj_get_info_by_fd(bpf_map__fd(map),
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&map_info, &map_info_len);
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CHECK(err, "get map info", "err %d errno %d", err, errno);
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return map_info.id;
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}
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void test_pinning(void)
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{
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const char *file_invalid = "./test_pinning_invalid.o";
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const char *custpinpath = "/sys/fs/bpf/custom/pinmap";
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const char *nopinpath = "/sys/fs/bpf/nopinmap";
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const char *nopinpath2 = "/sys/fs/bpf/nopinmap2";
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const char *custpath = "/sys/fs/bpf/custom";
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const char *pinpath = "/sys/fs/bpf/pinmap";
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const char *file = "./test_pinning.o";
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__u32 map_id, map_id2, duration = 0;
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struct stat statbuf = {};
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struct bpf_object *obj;
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struct bpf_map *map;
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int err, map_fd;
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DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
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.pin_root_path = custpath,
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);
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/* check that opening fails with invalid pinning value in map def */
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obj = bpf_object__open_file(file_invalid, NULL);
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err = libbpf_get_error(obj);
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if (CHECK(err != -EINVAL, "invalid open", "err %d errno %d\n", err, errno)) {
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obj = NULL;
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goto out;
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}
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/* open the valid object file */
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obj = bpf_object__open_file(file, NULL);
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err = libbpf_get_error(obj);
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if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
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obj = NULL;
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goto out;
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}
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err = bpf_object__load(obj);
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if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
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goto out;
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/* check that pinmap was pinned */
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err = stat(pinpath, &statbuf);
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if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
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goto out;
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/* check that nopinmap was *not* pinned */
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err = stat(nopinpath, &statbuf);
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if (CHECK(!err || errno != ENOENT, "stat nopinpath",
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"err %d errno %d\n", err, errno))
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goto out;
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/* check that nopinmap2 was *not* pinned */
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err = stat(nopinpath2, &statbuf);
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if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
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"err %d errno %d\n", err, errno))
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goto out;
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map_id = get_map_id(obj, "pinmap");
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if (!map_id)
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goto out;
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bpf_object__close(obj);
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obj = bpf_object__open_file(file, NULL);
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if (CHECK_FAIL(libbpf_get_error(obj))) {
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obj = NULL;
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goto out;
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}
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err = bpf_object__load(obj);
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if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
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goto out;
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/* check that same map ID was reused for second load */
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map_id2 = get_map_id(obj, "pinmap");
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if (CHECK(map_id != map_id2, "check reuse",
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"err %d errno %d id %d id2 %d\n", err, errno, map_id, map_id2))
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goto out;
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/* should be no-op to re-pin same map */
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map = bpf_object__find_map_by_name(obj, "pinmap");
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if (CHECK(!map, "find map", "NULL map"))
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goto out;
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err = bpf_map__pin(map, NULL);
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if (CHECK(err, "re-pin map", "err %d errno %d\n", err, errno))
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goto out;
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/* but error to pin at different location */
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err = bpf_map__pin(map, "/sys/fs/bpf/other");
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if (CHECK(!err, "pin map different", "err %d errno %d\n", err, errno))
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goto out;
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/* unpin maps with a pin_path set */
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err = bpf_object__unpin_maps(obj, NULL);
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if (CHECK(err, "unpin maps", "err %d errno %d\n", err, errno))
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goto out;
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/* and re-pin them... */
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err = bpf_object__pin_maps(obj, NULL);
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if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
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goto out;
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/* get pinning path */
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if (!ASSERT_STREQ(bpf_map__pin_path(map), pinpath, "get pin path"))
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goto out;
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/* set pinning path of other map and re-pin all */
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map = bpf_object__find_map_by_name(obj, "nopinmap");
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if (CHECK(!map, "find map", "NULL map"))
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goto out;
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err = bpf_map__set_pin_path(map, custpinpath);
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if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
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goto out;
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/* get pinning path after set */
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if (!ASSERT_STREQ(bpf_map__pin_path(map), custpinpath,
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"get pin path after set"))
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goto out;
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/* should only pin the one unpinned map */
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err = bpf_object__pin_maps(obj, NULL);
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if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
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goto out;
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/* check that nopinmap was pinned at the custom path */
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err = stat(custpinpath, &statbuf);
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if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
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goto out;
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/* remove the custom pin path to re-test it with auto-pinning below */
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err = unlink(custpinpath);
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if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
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goto out;
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err = rmdir(custpath);
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if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
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goto out;
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bpf_object__close(obj);
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/* open the valid object file again */
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obj = bpf_object__open_file(file, NULL);
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err = libbpf_get_error(obj);
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if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
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obj = NULL;
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goto out;
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}
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/* set pin paths so that nopinmap2 will attempt to reuse the map at
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* pinpath (which will fail), but not before pinmap has already been
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* reused
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*/
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bpf_object__for_each_map(map, obj) {
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if (!strcmp(bpf_map__name(map), "nopinmap"))
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err = bpf_map__set_pin_path(map, nopinpath2);
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else if (!strcmp(bpf_map__name(map), "nopinmap2"))
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err = bpf_map__set_pin_path(map, pinpath);
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else
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continue;
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if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
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goto out;
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}
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/* should fail because of map parameter mismatch */
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err = bpf_object__load(obj);
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if (CHECK(err != -EINVAL, "param mismatch load", "err %d errno %d\n", err, errno))
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goto out;
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/* nopinmap2 should have been pinned and cleaned up again */
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err = stat(nopinpath2, &statbuf);
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if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
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"err %d errno %d\n", err, errno))
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goto out;
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/* pinmap should still be there */
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err = stat(pinpath, &statbuf);
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if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
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goto out;
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bpf_object__close(obj);
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/* test auto-pinning at custom path with open opt */
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obj = bpf_object__open_file(file, &opts);
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if (CHECK_FAIL(libbpf_get_error(obj))) {
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obj = NULL;
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goto out;
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}
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err = bpf_object__load(obj);
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if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
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goto out;
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/* check that pinmap was pinned at the custom path */
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err = stat(custpinpath, &statbuf);
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if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
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goto out;
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/* remove the custom pin path to re-test it with reuse fd below */
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err = unlink(custpinpath);
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if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
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goto out;
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err = rmdir(custpath);
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if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
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goto out;
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bpf_object__close(obj);
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/* test pinning at custom path with reuse fd */
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obj = bpf_object__open_file(file, NULL);
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err = libbpf_get_error(obj);
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if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
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obj = NULL;
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goto out;
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}
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map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(__u32),
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sizeof(__u64), 1, 0);
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if (CHECK(map_fd < 0, "create pinmap manually", "fd %d\n", map_fd))
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goto out;
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map = bpf_object__find_map_by_name(obj, "pinmap");
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if (CHECK(!map, "find map", "NULL map"))
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goto close_map_fd;
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err = bpf_map__reuse_fd(map, map_fd);
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if (CHECK(err, "reuse pinmap fd", "err %d errno %d\n", err, errno))
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goto close_map_fd;
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err = bpf_map__set_pin_path(map, custpinpath);
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if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
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goto close_map_fd;
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err = bpf_object__load(obj);
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if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
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goto close_map_fd;
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/* check that pinmap was pinned at the custom path */
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err = stat(custpinpath, &statbuf);
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if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
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goto close_map_fd;
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close_map_fd:
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close(map_fd);
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out:
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unlink(pinpath);
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unlink(nopinpath);
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unlink(nopinpath2);
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unlink(custpinpath);
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rmdir(custpath);
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if (obj)
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bpf_object__close(obj);
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}
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