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[SCSI] lpfc 8.1.2: Add module parameter to limit number of outstanding commands per lpfc HBA 

Add module parameter to limit number of outstanding commands per lpfc HBA

Signed-off-by: Jamie Wellnitz <Jamie.Wellnitz@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Jamie Wellnitz 2006-02-28 19:25:21 -05:00 committed by James Bottomley
parent 406d6041ac
commit b28485acb9
1 changed files with 15 additions and 0 deletions
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15
drivers/scsi/lpfc/lpfc_attr.c
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@ -519,6 +519,16 @@ LPFC_ATTR_HEX_RW(log_verbose, 0x0, 0x0, 0xffff, "Verbose logging bit-mask");
LPFC_ATTR_R(lun_queue_depth, 30, 1, 128,
"Max number of FCP commands we can queue to a specific LUN");
/*
# hba_queue_depth: This parameter is used to limit the number of outstanding
# commands per lpfc HBA. Value range is [32,8192]. If this parameter
# value is greater than the maximum number of exchanges supported by the HBA,
# then maximum number of exchanges supported by the HBA is used to determine
# the hba_queue_depth.
*/
LPFC_ATTR_R(hba_queue_depth, 8192, 32, 8192,
"Max number of FCP commands we can queue to a lpfc HBA");
/*
# Some disk devices have a "select ID" or "select Target" capability.
# From a protocol standpoint "select ID" usually means select the
@ -649,6 +659,7 @@ struct class_device_attribute *lpfc_host_attrs[] = {
&class_device_attr_lpfc_drvr_version,
&class_device_attr_lpfc_log_verbose,
&class_device_attr_lpfc_lun_queue_depth,
&class_device_attr_lpfc_hba_queue_depth,
&class_device_attr_lpfc_nodev_tmo,
&class_device_attr_lpfc_fcp_class,
&class_device_attr_lpfc_use_adisc,
@ -1411,5 +1422,9 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
default:
phba->cfg_hba_queue_depth = LPFC_DFT_HBA_Q_DEPTH;
}
if (phba->cfg_hba_queue_depth > lpfc_hba_queue_depth)
lpfc_hba_queue_depth_init(phba, lpfc_hba_queue_depth);
return;
}