[PATCHv500/15] scsi: EH rework prep patches, part 2

[Hannes Reinecke <hare@suse.de>]

Hi all,

(taking up an old thread:)
here's the second batch of patches for my EH rework.
It modifies the reset callbacks for SCSI drivers
such that the final conversion to drop the 'struct scsi_cmnd'
argument and use the entity in question (host, bus, target, device)
as the argument to the SCSI EH callbacks becomes possible.
The second part covers drivers which require a bit more love.
In particular the fnic, snic, and csiostor drivers require a tag to
send TMFs. So to handle that I've modified the patches to call
scsi_alloc_request() with the NOWAIT flag; that will return a scsi
command with a valid tag. It might fail (eg when the tagset is full),
but in these cases it might be better to fall back to host_reset anyway.

As usual, comments and reviews are welcome.

Changes to v4:
- rework snic to use a dedicated tag for host reset
- rework snic to allocate TMFs on the fly
- rework fnic to allocate TMFs on the fly
- rework csiostor to allocat TMFs on the fly
- drop fc_block_rport() from zfcp host_reset
- Rebase to latest linus tree

Changes to v3:
- Move fnic and snic patches to the next patchset
- Include reviews from Ewan Milne

Changes to v2:
- Include reviews from John Garry
- move mpi3mr, zfcp, sym53c8xx_2, and qla1280 patches to the
  next patchset

Changes to the initial version:
- Include reviews from Christoph
- Fixup build robot issues

Hannes Reinecke (15):
  zfcp: do not wait for rports to become unblocked after host reset
  bfa: Do not use scsi command to signal TMF status
  aha152x: look for stuck command when resetting device
  a1000u2w: do not rely on the command for inia100_device_reset()
  fas216: Rework device reset to not rely on SCSI command pointer
  xen-scsifront: add scsi device as argument to scsifront_do_request()
  xen-scsifront: rework scsifront_action_handler()
  libiscsi: use cls_session as argument for target and session reset
  scsi_transport_iscsi: use session as argument for
    iscsi_block_scsi_eh()
  snic: reserve tag for TMF
  snic: allocate device reset command
  snic: Use scsi_host_busy_iter() to traverse commands
  fnic: allocate device reset command on the fly
  fnic: use fc_block_rport() correctly
  csiostor: use separate TMF command

 drivers/s390/scsi/zfcp_scsi.c       |   4 -
 drivers/scsi/a100u2w.c              |  43 +---
 drivers/scsi/aha152x.c              |  26 ++-
 drivers/scsi/arm/fas216.c           |  39 ++--
 drivers/scsi/be2iscsi/be_main.c     |  10 +-
 drivers/scsi/bfa/bfad_im.c          | 112 +++++-----
 drivers/scsi/bfa/bfad_im.h          |   2 +
 drivers/scsi/csiostor/csio_scsi.c   |  72 ++++---
 drivers/scsi/fnic/fnic.h            |   1 -
 drivers/scsi/fnic/fnic_scsi.c       | 115 +++++-----
 drivers/scsi/libiscsi.c             |  21 +-
 drivers/scsi/qla4xxx/ql4_os.c       |  34 +--
 drivers/scsi/scsi_transport_iscsi.c |   6 +-
 drivers/scsi/snic/snic.h            |   2 +-
 drivers/scsi/snic/snic_main.c       |   5 +-
 drivers/scsi/snic/snic_scsi.c       | 319 ++++++++++++----------------
 drivers/scsi/xen-scsifront.c        |  49 +++--
 include/scsi/libiscsi.h             |   2 +-
 include/scsi/scsi_transport_iscsi.h |   2 +-
 19 files changed, 414 insertions(+), 450 deletions(-)

-- 
2.35.3