mpi3mr_nvme_pt_sge
struct mpi3mr_nvme_pt_sge *nvme_sgl;
u32 sge_element_size = sizeof(struct mpi3mr_nvme_pt_sge);
nvme_sgl = (struct mpi3mr_nvme_pt_sge *)
memset(nvme_sgl, 0, sizeof(struct mpi3mr_nvme_pt_sge));
size = drv_buf_iter->num_dma_desc * sizeof(struct mpi3mr_nvme_pt_sge);
nvme_sgl = (struct mpi3mr_nvme_pt_sge *)mrioc->ioctl_chain_sge.addr;