unsigned char e100_D101M_checksum (struct e100_private * bdp, struct sk_buff * skb);
Sets the skb->csum value from D101 csum found at the end of the Rx frame. The D101M sums all words in frame excluding the ethernet II header (14 bytes) so in case the packet is ethernet II and the protocol is IP, all is need is to assign this value to skb->csum.