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  1. 01 Nov, 2017 14 commits
  3. 27 Oct, 2017 10 commits
  5. 23 Oct, 2017 2 commits
  7. 20 Oct, 2017 5 commits
    • James Smart's avatar
      nvme-fc: correct io timeout behavior · 134aedc9
      James Smart authored 
      The transport io timeout behavior wasn't quite correct. It ignored
that the io error handler is supposed to be synchronous so it possibly
allowed the blk request to be restarted while the io associated was
still aborting. Timeouts on reserved commands, those used for
association create, were never timing out thus they hung out forever.

To correct:
If an io is times out while a remoteport is not connected, just
restart the io timer. The lack of connectivity will simultaneously
be resetting the controller, so the reset path will abort and terminate
the io.

If an io is times out while it was marked for transport abort, just
reset the io timer. The abort process is underway and will complete
the io.

Otherwise, if an io times out, abort the io. If the abort was
unsuccessful (unlikely) give up and return not handled.

If the abort was successful, as the abort process is underway it will
terminate the io, so rather than synchronously waiting, just restart
the io timer.
Signed-off-by: default avatarJames Smart <james.smart@broadcom.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      134aedc9
    • James Smart's avatar
      nvme-fc: correct io termination handling · 0a02e39f
      James Smart authored 
      The io completion handling for i/o's that are failing due to
to a transport error or association termination had issues, causing
io failures (DNR set so retries didn't kick in) or long stalls.

Change the io completion handler for the following items:

When an io has been completed due to a transport abort (based on an
exchange error) or when marked as aborted as part of an association
termination (FCOP_FLAGS_TERMIO), set the NVME completion status to
NVME_SC_ABORTED. By default, do not set DNR on the status so that a
retry can be attempted after association recreate.

In cases where an io is failed (non-successful nvme status including
aborted), if the controller is being deleted (blk_queue_dying) or
the io was part of the ios used for association creation (ctrl state
is NEW or RECONNECTING), then additionally set the DNR bit so the io
will not be retried. If the failed io was part of association creation,
the failure will tear down the partially completioned association and
typically restart a new reconnect attempt (another create association
later).

Rearranged code flow to remove a largely unneeded local variable.
Signed-off-by: default avatarJames Smart <james.smart@broadcom.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      0a02e39f
    • Chaitanya Kulkarni's avatar
      nvme-pci: add SGL support · a7a7cbe3
      Chaitanya Kulkarni authored 
      This adds SGL support for NVMe PCIe driver, based on an earlier patch
from Rajiv Shanmugam Madeswaran <smrajiv15 at gmail.com>. This patch
refactors the original code and adds new module parameter sgl_threshold
to determine whether to use SGL or PRP for IOs.

The usage of SGLs is controlled by the sgl_threshold module parameter,
which allows to conditionally use SGLs if average request segment
size (avg_seg_size) is greater than sgl_threshold. In the original patch,
the decision of using SGLs was dependent only on the IO size,
with the new approach we consider not only IO size but also the
number of physical segments present in the IO.

We calculate avg_seg_size based on request payload bytes and number
of physical segments present in the request.

For e.g.:-

1. blk_rq_nr_phys_segments = 2 blk_rq_payload_bytes = 8k
avg_seg_size = 4K use sgl if avg_seg_size >= sgl_threshold.

2. blk_rq_nr_phys_segments = 2 blk_rq_payload_bytes = 64k
avg_seg_size = 32K use sgl if avg_seg_size >= sgl_threshold.

3. blk_rq_nr_phys_segments = 16 blk_rq_payload_bytes = 64k
avg_seg_size = 4K use sgl if avg_seg_size >= sgl_threshold.
Signed-off-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      a7a7cbe3
    • Christoph Hellwig's avatar
      nvme: use ida_simple_{get,remove} for the controller instance · 9843f685
      Christoph Hellwig authored 
      Switch to the ida_simple_* helpers instead of opencoding them.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
      9843f685
    • Roy Shterman's avatar
      nvmet: Change max_nsid in subsystem due to ns_disable if needed · ba2dec35
      Roy Shterman authored 
      In case we disable namespaces which has the nsid like
subsystem max_nsid we need to search for the next largest nsid
in this subsystem. If the subsystem don't has more namespaces
we set it to 0, else we take nsid from the last namespace in
namespaces list because the list is sorted while inserting.
Reviewed-by: default avatarMax Gurtovoy <maxg@mellanox.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarRoy Shterman <roys@lightbitslabs.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
[hch: slight refactor]
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      ba2dec35
  9. 19 Oct, 2017 4 commits
  11. 18 Oct, 2017 5 commits
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