MTHCA_ARBEL_MAX_WQES_PER_SEND_DB
if (unlikely(nreq == MTHCA_ARBEL_MAX_WQES_PER_SEND_DB)) {
dbhi = (MTHCA_ARBEL_MAX_WQES_PER_SEND_DB << 24) |
qp->sq.head += MTHCA_ARBEL_MAX_WQES_PER_SEND_DB;