Hi all,
quite some drivers use internal commands for various purposes, most
commonly sending TMFs or querying the HBA status.
While these commands use the same submission mechanism than normal
I/O commands, they will not be counted as outstanding commands,
requiring those drivers to implement their own mechanism to figure
out outstanding commands.
This patchset enables the use of reserved tags for the SCSI midlayer,
enabling LLDDs to rely on the block layer for tracking outstanding
commands.
More importantly, it allows LLDD to request a valid tag from the block
layer without having to implement some tracking mechanism within the
driver. This removes quite some hacks which were required for some
drivers (eg. fnic or snic).
As usual, comments and reviews are welcome.
Hannes Reinecke (24):
block: disable elevator for reserved tags
scsi: add scsi_{get,put}_reserved_cmd()
scsi: add 'nr_reserved_cmds' field to the SCSI host template
csiostor: use reserved command for LUN reset
scsi: add scsi_cmd_from_priv()
virtio_scsi: use reserved commands for TMF
scsi: add host tagset busy iterator
fnic: use reserved commands
fnic: use scsi_host_tagset_busy_iter() to traverse commands
scsi: allocate separate queue for reserved commands
scsi: add scsi_host_get_reserved_cmd()
hpsa: move hpsa_hba_inquiry after scsi_add_host()
hpsa: use reserved commands
hpsa: use blk_mq_tagset_busy_iter() to traverse outstanding commands
hpsa: drop refcount field from CommandList
snic: use reserved commands
snic: use tagset iter for traversing commands
scsi: Implement scsi_is_reserved_cmd()
aacraid: move scsi_add_host()
aacraid: use private commands
aacraid: replace cmd_list with scsi_host_tagset_busy_iter()
aacraid: use scsi_host_tagset_busy_iter() to traverse outstanding
commands
dpt_i2o: drop cmd_list usage
scsi: drop scsi command list
block/blk-mq.c | 22 +-
drivers/scsi/aacraid/aachba.c | 125 +++---
drivers/scsi/aacraid/aacraid.h | 6 +-
drivers/scsi/aacraid/comminit.c | 28 +-
drivers/scsi/aacraid/commsup.c | 134 +++---
drivers/scsi/aacraid/linit.c | 302 +++++++------
drivers/scsi/csiostor/csio_init.c | 3 +-
drivers/scsi/csiostor/csio_scsi.c | 48 +-
drivers/scsi/dpt_i2o.c | 23 +-
drivers/scsi/fnic/fnic_scsi.c | 916 ++++++++++++++++----------------------
drivers/scsi/hosts.c | 27 ++
drivers/scsi/hpsa.c | 310 ++++++-------
drivers/scsi/hpsa.h | 1 -
drivers/scsi/hpsa_cmd.h | 1 -
drivers/scsi/scsi.c | 1 -
drivers/scsi/scsi_lib.c | 69 +--
drivers/scsi/scsi_scan.c | 1 -
drivers/scsi/snic/snic.h | 2 +-
drivers/scsi/snic/snic_main.c | 3 +
drivers/scsi/snic/snic_scsi.c | 502 ++++++++++-----------
drivers/scsi/virtio_scsi.c | 100 ++---
include/linux/blk-mq.h | 2 +
include/scsi/scsi_cmnd.h | 12 +-
include/scsi/scsi_device.h | 1 -
include/scsi/scsi_host.h | 17 +-
include/scsi/scsi_tcq.h | 30 ++
26 files changed, 1311 insertions(+), 1375 deletions(-)
--
2.16.4
