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iIyUdGDhUq3WHka04K8YJnD1zmPd6+N4wXlK6RHOL9Xj6BCixe7q4PwJS4+roC+7gQEX6cGeFc9 acKIDCE8h5bN3rEw7sP/iCWC08MhoBC0Tw4ItTam216UDM7ia+Ij On 31/08/2026 14:38, Fuyu Zhao wrote: > > Add btf_module_names and nr_btf_module_names fields to > bpf_object_open_opts to support selective kernel module BTF loading. > > With btf_module_names: > - when provided, only the specified kernel module BTFs are loaded; > - when an empty list is provided, no module BTFs are loaded; > - when NULL, all module BTFs are loaded as before. > > This avoids unnecessary module BTF loading and reduces BPF object > loading time when only a subset of kernel module BTFs is needed. > > Suggested-by: Andrii Nakryiko > Signed-off-by: Fuyu Zhao > --- > tools/lib/bpf/libbpf.c | 117 +++++++++++++++++++++++++++++++++++++++++ > tools/lib/bpf/libbpf.h | 24 ++++++++- > 2 files changed, 140 insertions(+), 1 deletion(-) > > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c > index 514e4e9daa82..e19d0afd2592 100644 > --- a/tools/lib/bpf/libbpf.c > +++ b/tools/lib/bpf/libbpf.c > @@ -779,6 +779,9 @@ struct bpf_object { > char *token_path; > int token_fd; > > + char **btf_module_names; > + size_t nr_btf_module_names; > + > char path[]; > }; > > @@ -5803,6 +5806,103 @@ int bpf_core_add_cands(struct bpf_core_cand *local_cand, > return 0; > } > > +static void bpf_object_free_btf_module_names(struct bpf_object *obj) > +{ > + size_t i; > + > + if (!obj->btf_module_names) > + return; > + > + for (i = 0; i < obj->nr_btf_module_names; i++) > + zfree(&obj->btf_module_names[i]); > + zfree(&obj->btf_module_names); > + obj->nr_btf_module_names = 0; > +} > + > +static int bpf_object_init_btf_module_names(struct bpf_object *obj, > + const struct bpf_object_open_opts *opts) > +{ > + const char **names; > + size_t i, j, cnt; > + int err; > + > + names = OPTS_GET(opts, btf_module_names, NULL); > + if (!names) > + return 0; > + > + cnt = OPTS_GET(opts, nr_btf_module_names, 0); > + > + /* > + * Allocate one entry for an empty list to distinguish it from the > + * default behavior. > + */ > + obj->btf_module_names = calloc(cnt ?: 1, > + sizeof(*obj->btf_module_names)); > + if (!obj->btf_module_names) > + return -ENOMEM; > + > + for (i = 0; i < cnt; i++) { > + if (!names[i] || !names[i][0]) { > + pr_warn("invalid kernel module BTF name at index %zu\n", i); > + err = -EINVAL; > + goto err_out; > + } > + > + /* > + * The list is expected to be small, so a simple nested scan is > + * sufficient for duplicate detection. > + */ > + for (j = 0; j < i; j++) { > + if (strcmp(obj->btf_module_names[j], names[i]) == 0) { > + pr_warn("duplicate kernel module BTF name '%s'\n", > + names[i]); > + err = -EINVAL; > + goto err_out; > + } > + } > + > + obj->btf_module_names[i] = strdup(names[i]); > + if (!obj->btf_module_names[i]) { > + err = -ENOMEM; > + goto err_out; > + } > + > + obj->nr_btf_module_names++; > + } > + return 0; > + > +err_out: > + bpf_object_free_btf_module_names(obj); > + return err; > +} > + > +static bool is_module_btf_needed(const struct bpf_object *obj, const char *name) > +{ > + size_t i; > + > + if (!obj->btf_module_names) > + return true; > + > + for (i = 0; i < obj->nr_btf_module_names; i++) { > + if (strcmp(obj->btf_module_names[i], name) == 0) > + return true; > + } > + > + pr_debug("skipping module BTF '%s', not in btf_module_names\n", name); > + return false; > +} > + > +static bool no_module_btfs_needed(const struct bpf_object *obj) > +{ > + return obj->btf_module_names && !obj->nr_btf_module_names; > +} > + > +static bool all_needed_module_btfs_loaded(const struct bpf_object *obj) > +{ > + return obj->btf_module_names && > + obj->nr_btf_module_names == obj->btf_module_cnt; > +} > + > static int load_module_btfs(struct bpf_object *obj) > { > struct bpf_btf_info info; > @@ -5825,6 +5925,9 @@ static int load_module_btfs(struct bpf_object *obj) > if (!kernel_supports(obj, FEAT_MODULE_BTF)) > return 0; > > + if (no_module_btfs_needed(obj)) > + return 0; > + > while (true) { > err = bpf_btf_get_next_id(id, &id); > if (err && errno == ENOENT) > @@ -5867,6 +5970,11 @@ static int load_module_btfs(struct bpf_object *obj) > continue; > } > > + if (!is_module_btf_needed(obj, name)) { > + close(fd); > + continue; > + } > + > btf = btf_get_from_fd(fd, obj->btf_vmlinux); > err = libbpf_get_error(btf); > if (err) { > @@ -5891,6 +5999,9 @@ static int load_module_btfs(struct bpf_object *obj) > break; > } > obj->btf_module_cnt++; > + > + if (all_needed_module_btfs_loaded(obj)) > + break; > } > I was looking at the selftest in patch 2 and was a bit confused as to why specifying just "nonexistent_module" in the module list was a way to test the scenario where we fail to specify a module that is needed ("bpf_testmod" in that case). I think I see the answer here - we don't look at the module count and check it against the number we asked for after the loop completes. In the case of "nonexistent_module" our obj->btf_module_cnt is 0. Since all_needed_module_btfs_loaded() will evaluate to false in that case, we keep iterating over BTF ids. On loop exit shouldn't we check obj->btf_module_cnt in the case we asked for specific modules, and make sure it matches the requested number? > if (err) { > @@ -8508,6 +8619,10 @@ static struct bpf_object *bpf_object_open(const char *path, const void *obj_buf, > } > } > > + err = bpf_object_init_btf_module_names(obj, opts); > + if (err) > + goto out; > + > err = bpf_object__elf_init(obj); > err = err ? : bpf_object__elf_collect(obj); > err = err ? : bpf_object__collect_externs(obj); > @@ -9629,6 +9744,8 @@ void bpf_object__close(struct bpf_object *obj) > close(obj->jumptable_maps[i].fd); > zfree(&obj->jumptable_maps); > > + bpf_object_free_btf_module_names(obj); > + > free(obj); > } > > diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h > index b965ad571540..1cabf7e46554 100644 > --- a/tools/lib/bpf/libbpf.h > +++ b/tools/lib/bpf/libbpf.h > @@ -224,10 +224,32 @@ struct bpf_object_open_opts { > * point (/sys/fs/bpf), in case this default behavior is undesirable. > */ > const char *bpf_token_path; > + /* > + * Optional list of kernel module names whose BTFs should be loaded. > + * nr_btf_module_names specifies the number of entries in > + * btf_module_names. > + * > + * With btf_module_names: > + * - when provided, only the BTFs of the specified modules are loaded; > + * - when an empty list is provided, no module BTFs are loaded; > + * - when NULL, all module BTFs are loaded as before. > + * > + * The list must contain valid, non-empty module names and must not > + * contain duplicate entries; otherwise -EINVAL is returned. > + * > + * This affects: > + * - BPF CO-RE relocations against types defined in modules; > + * - BTF-based resolution of attach targets; > + * - module-qualified tracing multi-attach targets; > + * - struct_ops kernel type resolution; > + * - extern (ksym) resolution for kernel symbols defined in modules. > + */ > + const char **btf_module_names; > + size_t nr_btf_module_names; > > size_t :0; > }; > -#define bpf_object_open_opts__last_field bpf_token_path > +#define bpf_object_open_opts__last_field nr_btf_module_names > > /** > * @brief **bpf_object__open()** creates a bpf_object by opening > -- > 2.34.1 >