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libbpf: cleanup after partial failure in bpf_object__pin
bpftool will use bpf_object__pin in the next commits to pin all programs and maps from the file; in case of a partial failure, we need to get back to the clean state (undo previous program/map pins). As part of a cleanup, I've added and exported separate routines to pin all maps (bpf_object__pin_maps) and progs (bpf_object__pin_programs) of an object. Signed-off-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Stanislav Fomichev
Alexei Starovoitov
parent
108d50a976
commit
0c19a9fbc9
2 changed files with 319 additions and 23 deletions
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@ -1699,6 +1699,34 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path,
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return 0;
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}
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int bpf_program__unpin_instance(struct bpf_program *prog, const char *path,
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int instance)
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{
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int err;
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err = check_path(path);
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if (err)
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return err;
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if (prog == NULL) {
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pr_warning("invalid program pointer\n");
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return -EINVAL;
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}
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if (instance < 0 || instance >= prog->instances.nr) {
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pr_warning("invalid prog instance %d of prog %s (max %d)\n",
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instance, prog->section_name, prog->instances.nr);
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return -EINVAL;
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}
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err = unlink(path);
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if (err != 0)
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return -errno;
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pr_debug("unpinned program '%s'\n", path);
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return 0;
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}
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static int make_dir(const char *path)
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{
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char *cp, errmsg[STRERR_BUFSIZE];
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@ -1737,6 +1765,64 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
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if (err)
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return err;
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for (i = 0; i < prog->instances.nr; i++) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
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if (len < 0) {
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err = -EINVAL;
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goto err_unpin;
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} else if (len >= PATH_MAX) {
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err = -ENAMETOOLONG;
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goto err_unpin;
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}
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err = bpf_program__pin_instance(prog, buf, i);
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if (err)
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goto err_unpin;
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}
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return 0;
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err_unpin:
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for (i = i - 1; i >= 0; i--) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%d", path, i);
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if (len < 0)
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continue;
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else if (len >= PATH_MAX)
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continue;
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bpf_program__unpin_instance(prog, buf, i);
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}
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rmdir(path);
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return err;
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}
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int bpf_program__unpin(struct bpf_program *prog, const char *path)
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{
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int i, err;
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err = check_path(path);
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if (err)
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return err;
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if (prog == NULL) {
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pr_warning("invalid program pointer\n");
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return -EINVAL;
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}
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if (prog->instances.nr <= 0) {
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pr_warning("no instances of prog %s to pin\n",
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prog->section_name);
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return -EINVAL;
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}
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for (i = 0; i < prog->instances.nr; i++) {
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char buf[PATH_MAX];
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int len;
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@ -1747,11 +1833,15 @@ int bpf_program__pin(struct bpf_program *prog, const char *path)
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else if (len >= PATH_MAX)
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return -ENAMETOOLONG;
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err = bpf_program__pin_instance(prog, buf, i);
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err = bpf_program__unpin_instance(prog, buf, i);
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if (err)
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return err;
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}
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err = rmdir(path);
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if (err)
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return -errno;
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return 0;
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}
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@ -1776,12 +1866,33 @@ int bpf_map__pin(struct bpf_map *map, const char *path)
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}
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pr_debug("pinned map '%s'\n", path);
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return 0;
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}
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int bpf_object__pin(struct bpf_object *obj, const char *path)
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int bpf_map__unpin(struct bpf_map *map, const char *path)
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{
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int err;
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err = check_path(path);
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if (err)
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return err;
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if (map == NULL) {
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pr_warning("invalid map pointer\n");
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return -EINVAL;
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}
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err = unlink(path);
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if (err != 0)
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return -errno;
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pr_debug("unpinned map '%s'\n", path);
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return 0;
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}
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int bpf_object__pin_maps(struct bpf_object *obj, const char *path)
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{
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struct bpf_program *prog;
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struct bpf_map *map;
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int err;
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@ -1797,6 +1908,53 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
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if (err)
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return err;
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bpf_map__for_each(map, obj) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%s", path,
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bpf_map__name(map));
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if (len < 0) {
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err = -EINVAL;
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goto err_unpin_maps;
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} else if (len >= PATH_MAX) {
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err = -ENAMETOOLONG;
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goto err_unpin_maps;
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}
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err = bpf_map__pin(map, buf);
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if (err)
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goto err_unpin_maps;
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}
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return 0;
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err_unpin_maps:
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while ((map = bpf_map__prev(map, obj))) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%s", path,
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bpf_map__name(map));
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if (len < 0)
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continue;
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else if (len >= PATH_MAX)
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continue;
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bpf_map__unpin(map, buf);
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}
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return err;
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}
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int bpf_object__unpin_maps(struct bpf_object *obj, const char *path)
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{
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struct bpf_map *map;
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int err;
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if (!obj)
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return -ENOENT;
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bpf_map__for_each(map, obj) {
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char buf[PATH_MAX];
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int len;
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@ -1808,11 +1966,78 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
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else if (len >= PATH_MAX)
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return -ENAMETOOLONG;
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err = bpf_map__pin(map, buf);
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err = bpf_map__unpin(map, buf);
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if (err)
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return err;
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}
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return 0;
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}
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int bpf_object__pin_programs(struct bpf_object *obj, const char *path)
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{
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struct bpf_program *prog;
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int err;
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if (!obj)
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return -ENOENT;
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if (!obj->loaded) {
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pr_warning("object not yet loaded; load it first\n");
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return -ENOENT;
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}
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err = make_dir(path);
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if (err)
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return err;
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bpf_object__for_each_program(prog, obj) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%s", path,
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prog->section_name);
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if (len < 0) {
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err = -EINVAL;
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goto err_unpin_programs;
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} else if (len >= PATH_MAX) {
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err = -ENAMETOOLONG;
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goto err_unpin_programs;
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}
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err = bpf_program__pin(prog, buf);
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if (err)
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goto err_unpin_programs;
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}
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return 0;
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err_unpin_programs:
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while ((prog = bpf_program__prev(prog, obj))) {
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char buf[PATH_MAX];
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int len;
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len = snprintf(buf, PATH_MAX, "%s/%s", path,
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prog->section_name);
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if (len < 0)
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continue;
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else if (len >= PATH_MAX)
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continue;
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bpf_program__unpin(prog, buf);
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}
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return err;
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}
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int bpf_object__unpin_programs(struct bpf_object *obj, const char *path)
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{
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struct bpf_program *prog;
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int err;
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if (!obj)
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return -ENOENT;
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bpf_object__for_each_program(prog, obj) {
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char buf[PATH_MAX];
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int len;
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@ -1824,7 +2049,7 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
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else if (len >= PATH_MAX)
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return -ENAMETOOLONG;
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err = bpf_program__pin(prog, buf);
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err = bpf_program__unpin(prog, buf);
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if (err)
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return err;
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}
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@ -1832,6 +2057,23 @@ int bpf_object__pin(struct bpf_object *obj, const char *path)
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return 0;
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}
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int bpf_object__pin(struct bpf_object *obj, const char *path)
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{
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int err;
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err = bpf_object__pin_maps(obj, path);
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if (err)
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return err;
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err = bpf_object__pin_programs(obj, path);
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if (err) {
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bpf_object__unpin_maps(obj, path);
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return err;
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}
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return 0;
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}
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void bpf_object__close(struct bpf_object *obj)
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{
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size_t i;
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@ -1918,23 +2160,20 @@ void *bpf_object__priv(struct bpf_object *obj)
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}
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static struct bpf_program *
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__bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
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__bpf_program__iter(struct bpf_program *p, struct bpf_object *obj, int i)
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{
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size_t idx;
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ssize_t idx;
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if (!obj->programs)
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return NULL;
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/* First handler */
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if (prev == NULL)
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return &obj->programs[0];
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if (prev->obj != obj) {
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if (p->obj != obj) {
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pr_warning("error: program handler doesn't match object\n");
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return NULL;
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}
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idx = (prev - obj->programs) + 1;
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if (idx >= obj->nr_programs)
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idx = (p - obj->programs) + i;
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if (idx >= obj->nr_programs || idx < 0)
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return NULL;
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return &obj->programs[idx];
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}
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@ -1944,8 +2183,29 @@ bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
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{
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struct bpf_program *prog = prev;
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if (prev == NULL)
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return obj->programs;
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do {
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prog = __bpf_program__next(prog, obj);
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prog = __bpf_program__iter(prog, obj, 1);
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} while (prog && bpf_program__is_function_storage(prog, obj));
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return prog;
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}
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struct bpf_program *
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bpf_program__prev(struct bpf_program *next, struct bpf_object *obj)
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{
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struct bpf_program *prog = next;
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if (next == NULL) {
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if (!obj->nr_programs)
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return NULL;
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return obj->programs + obj->nr_programs - 1;
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}
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do {
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prog = __bpf_program__iter(prog, obj, -1);
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} while (prog && bpf_program__is_function_storage(prog, obj));
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return prog;
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@ -2272,10 +2532,10 @@ void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex)
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map->map_ifindex = ifindex;
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}
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struct bpf_map *
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bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
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static struct bpf_map *
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__bpf_map__iter(struct bpf_map *m, struct bpf_object *obj, int i)
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{
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size_t idx;
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ssize_t idx;
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struct bpf_map *s, *e;
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if (!obj || !obj->maps)
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@ -2284,21 +2544,39 @@ bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
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s = obj->maps;
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e = obj->maps + obj->nr_maps;
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if (prev == NULL)
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return s;
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if ((prev < s) || (prev >= e)) {
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if ((m < s) || (m >= e)) {
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pr_warning("error in %s: map handler doesn't belong to object\n",
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__func__);
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return NULL;
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}
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idx = (prev - obj->maps) + 1;
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if (idx >= obj->nr_maps)
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idx = (m - obj->maps) + i;
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if (idx >= obj->nr_maps || idx < 0)
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return NULL;
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return &obj->maps[idx];
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}
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struct bpf_map *
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bpf_map__next(struct bpf_map *prev, struct bpf_object *obj)
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{
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if (prev == NULL)
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return obj->maps;
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return __bpf_map__iter(prev, obj, 1);
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}
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struct bpf_map *
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bpf_map__prev(struct bpf_map *next, struct bpf_object *obj)
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{
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if (next == NULL) {
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if (!obj->nr_maps)
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return NULL;
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return obj->maps + obj->nr_maps - 1;
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}
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return __bpf_map__iter(next, obj, -1);
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}
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struct bpf_map *
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bpf_object__find_map_by_name(struct bpf_object *obj, const char *name)
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{
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@ -71,6 +71,13 @@ struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
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LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
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size_t obj_buf_sz,
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const char *name);
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LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
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LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
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const char *path);
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LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
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LIBBPF_API void bpf_object__close(struct bpf_object *object);
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@ -112,6 +119,9 @@ LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
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(pos) != NULL; \
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(pos) = bpf_program__next((pos), (obj)))
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LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
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struct bpf_object *obj);
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typedef void (*bpf_program_clear_priv_t)(struct bpf_program *,
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void *);
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@ -131,7 +141,11 @@ LIBBPF_API int bpf_program__fd(struct bpf_program *prog);
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LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
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const char *path,
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int instance);
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LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
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const char *path,
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int instance);
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LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
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LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
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LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
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struct bpf_insn;
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@ -260,6 +274,9 @@ bpf_map__next(struct bpf_map *map, struct bpf_object *obj);
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(pos) != NULL; \
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(pos) = bpf_map__next((pos), (obj)))
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LIBBPF_API struct bpf_map *
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bpf_map__prev(struct bpf_map *map, struct bpf_object *obj);
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LIBBPF_API int bpf_map__fd(struct bpf_map *map);
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LIBBPF_API const struct bpf_map_def *bpf_map__def(struct bpf_map *map);
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LIBBPF_API const char *bpf_map__name(struct bpf_map *map);
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@ -274,6 +291,7 @@ LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
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LIBBPF_API bool bpf_map__is_offload_neutral(struct bpf_map *map);
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||||
LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
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||||
LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
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||||
LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
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||||
|
||||
LIBBPF_API long libbpf_get_error(const void *ptr);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue