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| H A D | nvme.c | beb5f521392e7da208455f3bf0c86bc141c0879d Thu Aug 03 09:31:02 UTC 2017 Bin Meng <bmeng.cn@gmail.com> nvme: Handle zero Maximum Data Transfer Size (MDTS)
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. On the real NVMe card this is normally not
0 due to hardware restrictions, but with QEMU emulated NVMe
device it reports as 0. 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);
dev->max_transfer_shift being 0 will for sure cause lbas to
overflow. Let's use 20. With this fix, the NVMe driver works
on QEMU emulated NVMe device.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
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