diff options
| author | Don Brace <don.brace@pmcs.com> | 2015-01-24 01:43:30 +0300 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2015-02-02 20:57:40 +0300 |
| commit | 03383736348bb73a45f8460afca3c5f5bd1be172 (patch) | |
| tree | bd4d9b4450027d3f9f4f259d60c000558a68d7f4 /drivers/scsi/hpsa.h | |
| parent | 080ef1cc7fdf5d0800775c8626718da807e7ba99 (diff) | |
| download | linux-03383736348bb73a45f8460afca3c5f5bd1be172.tar.xz | |
hpsa: honor queue depth of physical devices
When using the ioaccel submission methods, requests destined for RAID volumes
are sometimes diverted to physical devices. The OS has no or limited
knowledge of these physical devices, so it is up to the driver to avoid
pushing the device too hard. It is better to honor the physical device queue
limit rather than making the device spew zillions of TASK SET FULL responses.
This is so that hpsa based devices support /sys/block/sdNN/device/queue_type
of simple, which lets the SCSI midlayer automatically adjust the queue_depth
based on TASK SET FULL and GOOD status.
Adjust the queue depth for a new device after it is created based on the
maximum queue depths of the physical devices that constitute the
device. This drops the maximum queue depth from .can_queue of 1024 to
something like 174 for single-drive RAID-0, 348 for two-drive RAID-1, etc.
It also adjusts for the ratio of data to parity drives.
Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Webb Scales <webbnh@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/hpsa.h')
| -rw-r--r-- | drivers/scsi/hpsa.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index a0f4268df457..d0fb854195ee 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -46,6 +46,11 @@ struct hpsa_scsi_dev_t { unsigned char model[16]; /* bytes 16-31 of inquiry data */ unsigned char raid_level; /* from inquiry page 0xC1 */ unsigned char volume_offline; /* discovered via TUR or VPD */ + u16 queue_depth; /* max queue_depth for this device */ + atomic_t ioaccel_cmds_out; /* Only used for physical devices + * counts commands sent to physical + * device via "ioaccel" path. + */ u32 ioaccel_handle; int offload_config; /* I/O accel RAID offload configured */ int offload_enabled; /* I/O accel RAID offload enabled */ @@ -54,6 +59,15 @@ struct hpsa_scsi_dev_t { */ struct raid_map_data raid_map; /* I/O accelerator RAID map */ + /* + * Pointers from logical drive map indices to the phys drives that + * make those logical drives. Note, multiple logical drives may + * share physical drives. You can have for instance 5 physical + * drives with 3 logical drives each using those same 5 physical + * disks. We need these pointers for counting i/o's out to physical + * devices in order to honor physical device queue depth limits. + */ + struct hpsa_scsi_dev_t *phys_disk[RAID_MAP_MAX_ENTRIES]; }; struct reply_queue_buffer { |