LARTC - May 2002 - what''s the meaning of this "struct qdisc_rate_table"

LARTC，hello！

As title, and I want to know its member's purpose:

struct tc_ratespec
{
	unsigned char		cell_log;
	unsigned char		__reserved;
	unsigned short	feature;
	short			addend;
	unsigned short	mpu;
	__u32			rate;
};

who can help me? Thanks!   

　　　best regards!

 				
　　　　　　　　　　　　　　Huang Xin Gang
　　　　　　　　　　　　　　hxgang@csnet4.cs.tsinghua.edu.cn
　　　　　　　　　　　　　　　　　2002-05-16