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nvme-scsi: Consider LBA format in IO splitting calculation

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The current command submission code uses a sector-based value when
considering the maximum number of blocks per command. With a
4k-formatted namespace and a command exceeding max hardware limits, this
calculation doesn't split IOs which should be split and fails in the
nvme layer. This patch fixes that calculation and enables IO splitting
in these circumstances.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jon Derrick 2017-04-24 18:02:43 -06:00 committed by Christoph Hellwig
parent de41447aac
commit 7fad1fd46c
1 changed files with 1 additions and 1 deletions
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drivers/nvme/host/scsi.c
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@ -1609,7 +1609,7 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
struct nvme_command c; struct nvme_command c;
u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read); u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
u16 control; u16 control;
u32 max_blocks = queue_max_hw_sectors(ns->queue); u32 max_blocks = queue_max_hw_sectors(ns->queue) >> (ns->lba_shift - 9);
num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks); num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);