ntb_payload_header
struct ntb_payload_header __iomem *tx_hdr;
struct ntb_payload_header *rx_hdr;
struct ntb_payload_header *hdr;
hdr = offset + qp->rx_max_frame - sizeof(struct ntb_payload_header);
struct ntb_payload_header __iomem *hdr = entry->tx_hdr;
struct ntb_payload_header __iomem *hdr;
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header);
sizeof(struct ntb_payload_header));
memset(offset, 0, sizeof(struct ntb_payload_header));