rtl_iov_pull_data
hdr = rtl_iov_pull_data(&iov, sizeof(*hdr));
common_subsec = rtl_iov_pull_data(&iov, sizeof(*common_subsec));
ptr = rtl_iov_pull_data(&iov, subsec_len);
hdr = rtl_iov_pull_data(&iov, sizeof(*hdr));
section = rtl_iov_pull_data(&iov, sizeof(*section));
ptr = rtl_iov_pull_data(&iov, section_len);