PROG_NAME_MAX_LEN
char prog_name[PROG_NAME_MAX_LEN];
ret = snprintf(prog_name, PROG_NAME_MAX_LEN, "__encap_");
ret = build_subtest_name(cfg, prog_name + ret, PROG_NAME_MAX_LEN - ret);
char local_name[PROG_NAME_MAX_LEN]; /* BPF prog to attach to local_veth */
char remote_name[PROG_NAME_MAX_LEN]; /* BPF prog to attach to remote_veth */