+ else {
+ /*
+ * Maximum Data Transfer Size (MDTS) field indicates the maximum
+ * data transfer size between the host and the controller. The
+ * host should not submit a command that exceeds this transfer
+ * size. The value is in units of the minimum memory page size
+ * and is reported as a power of two (2^n).
+ *
+ * The spec also says: a value of 0h indicates no restrictions
+ * on transfer size. But in nvme_blk_read/write() below we have
+ * the following algorithm for maximum number of logic blocks
+ * per transfer:
+ *
+ * u16 lbas = 1 << (dev->max_transfer_shift - ns->lba_shift);
+ *
+ * In order for lbas not to overflow, the maximum number is 15
+ * which means dev->max_transfer_shift = 15 + 9 (ns->lba_shift).
+ * Let's use 20 which provides 1MB size.
+ */
+ dev->max_transfer_shift = 20;
+ }