fcp_xfer_rdy_iu_t
fcp_xfer_rdy_iu_t *xfer = io->xfer_rdy.virt;
sizeof(fcp_xfer_rdy_iu_t) * hw->config.n_io,
io->xfer_rdy.size = sizeof(fcp_xfer_rdy_iu_t);
xfer_virt += sizeof(fcp_xfer_rdy_iu_t);
xfer_phys += sizeof(fcp_xfer_rdy_iu_t);