nvmet: implement valid sqhd values in completions

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To support sqhd, for initiators that are following the spec and
paying attention to sqhd vs their sqtail values:

- add sqhd to struct nvmet_sq
- initialize sqhd to 0 in nvmet_sq_setup
- rather than propagate the 0's-based qsize value from the connect message
  which requires a +1 in every sqhd update, and as nothing else references
  it, convert to 1's-based value in nvmt_sq/cq_setup() calls.
- validate connect message sqsize being non-zero per spec.
- updated assign sqhd for every completion that goes back.

Also remove handling the NULL sq case in __nvmet_req_complete, as it can't
happen with the current code.

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

This commit is contained in:

James Smart 2017-09-18 09:08:29 -07:00 • committed by Jens Axboe

parent 8edd11c9ad

commit bb1cc74790

3 changed files with 12 additions and 6 deletions

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8

drivers/nvme/target/core.c

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9

drivers/nvme/target/fabrics-cmd.c

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1

drivers/nvme/target/nvmet.h

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