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scsi: mpt3sas: Introduce module parameter to override queue depth

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This patch provides a module parameter and sysfs interface to select
whether the queue depth for each device should be based on the
protocol-specific value set by the driver (the default) or the maximum
supported by the controller (can_queue).

Although we have a sysfs interface per sdev to change the queue depth
of individual scsi devices, this implementation provides a single
sysfs entry per shost to switch between the controller max and the
driver default.

[mkp: tweaked commit desc]

Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Sreekanth Reddy
2019-08-22 02:19:01 -04:00
committed by Martin K. Petersen
parent dd93b14370
commit 8dc8d29a00
3 changed files with 140 additions and 4 deletions
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2
drivers/scsi/mpt3sas/mpt3sas_base.h
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@@ -1232,6 +1232,7 @@ struct MPT3SAS_ADAPTER {
u16 thresh_hold;
u8 high_iops_queues;
u32 drv_support_bitmap;
bool enable_sdev_max_qd;
/* internal commands, callback index */
u8 scsi_io_cb_idx;
@@ -1587,6 +1588,7 @@ struct _pcie_device *mpt3sas_get_pdev_by_handle(struct MPT3SAS_ADAPTER *ioc,
void mpt3sas_port_enable_complete(struct MPT3SAS_ADAPTER *ioc);
struct _raid_device *
mpt3sas_raid_device_find_by_handle(struct MPT3SAS_ADAPTER *ioc, u16 handle);
void mpt3sas_scsih_change_queue_depth(struct scsi_device *sdev, int qdepth);
/* config shared API */
u8 mpt3sas_config_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,