tx_frame_hdr
hw->extra_tx_headroom = sizeof(struct tx_frame_hdr) +
struct tx_frame_hdr *tx_fhdr =
(struct tx_frame_hdr *)skb->data;
skb_pull(skb, sizeof(struct tx_frame_hdr));
struct tx_frame_hdr tx_hdr;
memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
struct tx_frame_hdr *hdr;
hdr = (struct tx_frame_hdr *) skb->data;