tx_pkt_hdr
struct tx_pkt_hdr *tp;
tp = (struct tx_pkt_hdr *) skb->data;
(pad_bytes + sizeof(struct tx_pkt_hdr));
(pad_bytes + sizeof(struct tx_pkt_hdr));
struct tx_pkt_hdr *tp;
len = sizeof(struct tx_pkt_hdr) + 15;
headroom = align + sizeof(struct tx_pkt_hdr);
len = skb->len - sizeof(struct tx_pkt_hdr);