Hi,
I don't understand how this patchset works. My testing shows scsi_debug is
broken and I will be sending a correcting patch shortly (similar to the
one I
sent you on 20210108).

Hi Doug -

scsi_debug patch from this series works on my setup. I was under impression
that you want this patch to be available in tree and on top of current
patchset, you want to have further incremental update.
What do you suggest ? Do you want me to wait for your updated patch OR We
can ask Martin to pick all the patches except scsi_debug ? You can post
scsi_debug changes as another series or separate patch.

I have few more megaraid_sas patches in pipeline, so I am looking for this
series to be available as baseline.

Kashyap

The scsi_debug driver is a simplified LLD that needs to know in advance
whether a request/command issued to it will be using the .mq_poll
callback.
Perhaps you have found another way but one simple way to find that out is
this test:
    if (request->cmd_flags & REQ_HIPRI)

Agree. I am not very much familiar with scsi_debug code so used current code
change as starting point and from there things can be improved.

In the case of scsi_debug (after my patch) the delay associated with the
command is not wired up to generate an event which leads to completion.
Instead, callbacks through .mq_poll are expected and they will check if
that
delay has expired, if not the callback returns 0. When the delay has
expired
and a .mq_poll is received then completion occurs.

Doug Gilbert

quoted

v3 ->
- added reviewed-by tag
- Fix comment provided by Hannes for below patch.
https://patchwork.kernel.org/project/linux-scsi/patch/20201203034100.2
9716-3-kashyap.desai@broadcom.com/
- Fix Functional issue of poll_queues settings not working in v2.

v2 ->
- updated feedback from v1.
- added reviewed-by & tested-by tag
- remove flood of prints in scsi_debug driver during iopoll
   reported by Douglas Gilbert.
- added new patch to support to get shost from hctx.
   added new helper function "scsi_init_hctx"

v1 ->
Fixed warnings in scsi_debug driver.
Reported-by: kernel test robot <redacted>

Kashyap Desai (4):
   add io_uring with IOPOLL support in scsi layer
   megaraid_sas: iouring iopoll support
   scsi_debug : iouring iopoll support
   scsi: set shost as hctx driver_data

  drivers/scsi/megaraid/megaraid_sas.h        |   3 +
  drivers/scsi/megaraid/megaraid_sas_base.c   |  87 +++++++++++--
  drivers/scsi/megaraid/megaraid_sas_fusion.c |  42 ++++++-
  drivers/scsi/megaraid/megaraid_sas_fusion.h |   2 +
  drivers/scsi/scsi_debug.c                   | 130 ++++++++++++++++++++
  drivers/scsi/scsi_lib.c                     |  29 ++++-
  include/scsi/scsi_cmnd.h                    |   1 +
  include/scsi/scsi_host.h                    |  11 ++
  8 files changed, 291 insertions(+), 14 deletions(-)


base-commit: a927ec3995427e9c47752900ad2df0755d02aba5