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Subject[PATCH v3 0/6] Handle update hardware queues and queue freeze more carefully
Date
Hi,

I've replaced my 'nvme_start_freeze' patch with the two patches from
James and gave it another test run on top of Ming's 'v2 fix
blk_mq_alloc_request_hctx' series. All looks good.

Thanks,
Daniel


v1:
- https://lore.kernel.org/linux-nvme/20210625101649.49296-1-dwagner@suse.de/
v2:
- https://lore.kernel.org/linux-nvme/20210708092755.15660-1-dwagner@suse.de/
- reviewed tags collected
- added 'update hardware queues' for all transport
- added fix for fc hanger in nvme_wait_freeze_timeout
v3:
- dropped 'nvme-fc: Freeze queues before destroying them'
- added James' two patches


Initial cover letter:

this is a followup on the crash I reported in

https://lore.kernel.org/linux-block/20210608183339.70609-1-dwagner@suse.de/

By moving the hardware check up the crash was gone. Unfortuntatly, I
don't understand why this fixes the crash. The per-cpu access is
crashing but I can't see why the blk_mq_update_nr_hw_queues() is
fixing this problem.

Even though I can't explain why it fixes it, I think it makes sense to
update the hardware queue mapping bevore we recreate the IO
queues. Thus I avoided in the commit message to say it fixes
something.

Also during testing I observed the we hang indivinetly in
blk_mq_freeze_queue_wait(). Again I can't explain why we get stuck
there but given a common pattern for the nvme_wait_freeze() is to use
it with a timeout I think the timeout should be used too :)

Anyway, someone with more undertanding of the stack can explain the
problems.

Daniel Wagner (3):
nvme-fc: Update hardware queues before using them
nvme-rdma: Update number of hardware queues before using them
nvme-fc: Wait with a timeout for queue to freeze

Hannes Reinecke (1):
nvme-tcp: Update number of hardware queues before using them

James Smart (2):
nvme-fc: avoid race between time out and tear down
nvme-fc: fix controller reset hang during traffic

drivers/nvme/host/fc.c | 28 +++++++++++++++++++---------
drivers/nvme/host/rdma.c | 13 ++++++-------
drivers/nvme/host/tcp.c | 14 ++++++--------
3 files changed, 31 insertions(+), 24 deletions(-)

--
2.29.2

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