IB_BTH_BYTES
IB_BTH_BYTES +
IB_BTH_BYTES +
IB_BTH_BYTES +
IB_BTH_BYTES +
len += IB_BTH_BYTES;
hdr_len -= IB_BTH_BYTES;
hdr_len -= IB_BTH_BYTES;
mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +