[PATCH 9/22] lpfc 8.1.2 : Add module parameter to limit number of outstanding commands per lpfc HBA

[James Smart <James.Smart@Emulex.Com>]

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


Signed-off-by: James Smart <James.Smart@emulex.com>

--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -520,6 +520,16 @@ 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
  # Fibre channel "ALPA".  In the FC-AL Profile there is an "informative
@@ -649,6 +659,7 @@ struct class_device_attribute *lpfc_host
  	&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;
  }