On 23/08/2019 14:26, John Garry wrote:
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.
Hi Hannes,
JFYI, I have rebased this series to 5.6-rc4 here:
https://github.com/hisilicon/kernel-dev/tree/private-topic-sas-5.6-resv-commands-v1
I am interested in enabling this for libsas and associated HBAs, so
there are some patches on top for that.
No review comments have been addressed, apart from removing "block:
disable elevator for reserved tags"
Please let me know your plan for this series.
Thanks,
John
I was wondering if you have any plans to progress this series?
I don't mind helping out...
Cheers,
John
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
