[realtek] I can\'t understand the Rx packet header

[realtekmail@secsm.org]

I am reading the rtl8139c datasheet.
but..I can\'t understand the rx packet header.

and, I am reading the (kernel_src)/driver/net/8139too.c
see the next line statement ,

        rx_status = le32_to_cpu (*(u32 *) (rx_ring + ring_offset));
        rx_size = rx_status >> 16;

it said that  16 bit is size, and 16bit is status.
But I coundn\'t find the full Rx packet header ,
size and status is all??? 
is  other field exist ?

Thank you !