From: Andrii Nakryiko Date: Thu, 13 Jun 2019 05:04:57 +0000 (-0700) Subject: libbpf: fix check for presence of associated BTF for map creation X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e55d54f43d3f11718d9e2800225097fda498e141;p=openwrt%2Fstaging%2Fblogic.git libbpf: fix check for presence of associated BTF for map creation Kernel internally checks that either key or value type ID is specified, before using btf_fd. Do the same in libbpf's map creation code for determining when to retry map creation w/o BTF. Reported-by: Dan Carpenter Fixes: fba01a0689a9 ("libbpf: use negative fd to specify missing BTF") Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann --- diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index dd8b2cd5d3a7..e725fa86b189 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1736,7 +1736,7 @@ bpf_object__create_maps(struct bpf_object *obj) create_attr.key_size = def->key_size; create_attr.value_size = def->value_size; create_attr.max_entries = def->max_entries; - create_attr.btf_fd = -1; + create_attr.btf_fd = 0; create_attr.btf_key_type_id = 0; create_attr.btf_value_type_id = 0; if (bpf_map_type__is_map_in_map(def->type) && @@ -1750,11 +1750,12 @@ bpf_object__create_maps(struct bpf_object *obj) } *pfd = bpf_create_map_xattr(&create_attr); - if (*pfd < 0 && create_attr.btf_fd >= 0) { + if (*pfd < 0 && (create_attr.btf_key_type_id || + create_attr.btf_value_type_id)) { cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg)); pr_warning("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n", map->name, cp, errno); - create_attr.btf_fd = -1; + create_attr.btf_fd = 0; create_attr.btf_key_type_id = 0; create_attr.btf_value_type_id = 0; map->btf_key_type_id = 0; @@ -2045,7 +2046,7 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt, load_attr.license = license; load_attr.kern_version = kern_version; load_attr.prog_ifindex = prog->prog_ifindex; - load_attr.prog_btf_fd = prog->btf_fd; + load_attr.prog_btf_fd = prog->btf_fd >= 0 ? prog->btf_fd : 0; load_attr.func_info = prog->func_info; load_attr.func_info_rec_size = prog->func_info_rec_size; load_attr.func_info_cnt = prog->func_info_cnt;