Commit b28485ac authored by Jamie Wellnitz's avatar Jamie Wellnitz Committed by James Bottomley
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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: default avatarJamie Wellnitz <Jamie.Wellnitz@emulex.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 406d6041

drivers/scsi/lpfc/lpfc_attr.c

+15 −0
Original line number Diff line number Diff line
@@ -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;

}