- * @userdata: Is passed to user-space as %OVS_PACKET_ATTR_USERDATA if @cmd is
- * %OVS_PACKET_CMD_ACTION.
+ * @userdata: If nonnull, its u64 value is extracted and passed to userspace as
+ * %OVS_PACKET_ATTR_USERDATA.
+ * @pid: Netlink PID to which packet should be sent. If @pid is 0 then no
+ * packet is sent and the packet is accounted in the datapath's @n_lost
+ * counter.