+ - ``types [{RSS hash type} [...]] end``: RSS hash types, allowed tokens
+ are the same as `set_hash_input_set`_, an empty list means none (0).
+
+ - ``key {string}``: RSS hash key, overrides ``key_len``.
+
+ - ``key_len {unsigned}``: RSS hash key length in bytes, can be used in
+ conjunction with ``key`` to pad or truncate it.
+