kernel/include/uapi/linux/bpf.h
.. .. @@ -976,7 +976,9 @@ 976 976 * performed again, if the helper is used in combination with 977 977 * direct packet access. 978 978 * Return 979 - * 0 on success, or a negative error in case of failure.979 + * 0 on success, or a negative error in case of failure. Positive980 + * error indicates a potential drop or congestion in the target981 + * device. The particular positive error codes are not defined.980 982 * 981 983 * u64 bpf_get_current_pid_tgid(void) 982 984 * Return