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[SCSI] lpfc 8.2.8 v2 : Add sysfs control of target queue depth handling

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Added new sysfs attribute lpfc_max_scsicmpl_time. Attribute, when enabled,
will control target queue depth based on I/O completion time.

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Smart 2008-09-07 11:52:04 -04:00 • committed by James Bottomley
parent b522d7d42d
commit 977b5a0af6
6 changed files with 85 additions and 0 deletions
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44
drivers/scsi/lpfc/lpfc_attr.c
View file

@ -2296,6 +2296,48 @@ LPFC_VPORT_ATTR_R(fcp_class, 3, 2, 3,
LPFC_VPORT_ATTR_RW(use_adisc, 0, 0, 1,
"Use ADISC on rediscovery to authenticate FCP devices");
/*
# lpfc_max_scsicmpl_time: Use scsi command completion time to control I/O queue
# depth. Default value is 0. When the value of this parameter is zero the
# SCSI command completion time is not used for controlling I/O queue depth. When
# the parameter is set to a non-zero value, the I/O queue depth is controlled
# to limit the I/O completion time to the parameter value.
# The value is set in milliseconds.
*/
static int lpfc_max_scsicmpl_time;
module_param(lpfc_max_scsicmpl_time, int, 0);
MODULE_PARM_DESC(lpfc_max_scsicmpl_time,
"Use command completion time to control queue depth");
lpfc_vport_param_show(max_scsicmpl_time);
lpfc_vport_param_init(max_scsicmpl_time, 0, 0, 60000);
static int
lpfc_max_scsicmpl_time_set(struct lpfc_vport *vport, int val)
{
struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
struct lpfc_nodelist *ndlp, *next_ndlp;
if (val == vport->cfg_max_scsicmpl_time)
return 0;
if ((val < 0) || (val > 60000))
return -EINVAL;
vport->cfg_max_scsicmpl_time = val;
spin_lock_irq(shost->host_lock);
list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
if (!NLP_CHK_NODE_ACT(ndlp))
continue;
if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
continue;
ndlp->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
}
spin_unlock_irq(shost->host_lock);
return 0;
}
lpfc_vport_param_store(max_scsicmpl_time);
static DEVICE_ATTR(lpfc_max_scsicmpl_time, S_IRUGO | S_IWUSR,
lpfc_max_scsicmpl_time_show,
lpfc_max_scsicmpl_time_store);
/*
# lpfc_ack0: Use ACK0, instead of ACK1 for class 2 acknowledgement. Value
# range is [0,1]. Default value is 0.
@ -2459,6 +2501,7 @@ struct device_attribute *lpfc_hba_attrs[] = {
&dev_attr_lpfc_enable_hba_reset,
&dev_attr_lpfc_enable_hba_heartbeat,
&dev_attr_lpfc_sg_seg_cnt,
&dev_attr_lpfc_max_scsicmpl_time,
NULL,
};
@ -3580,6 +3623,7 @@ lpfc_get_vport_cfgparam(struct lpfc_vport *vport)
lpfc_restrict_login_init(vport, lpfc_restrict_login);
lpfc_fcp_class_init(vport, lpfc_fcp_class);
lpfc_use_adisc_init(vport, lpfc_use_adisc);
lpfc_max_scsicmpl_time_init(vport, lpfc_max_scsicmpl_time);
lpfc_fdmi_on_init(vport, lpfc_fdmi_on);
lpfc_discovery_threads_init(vport, lpfc_discovery_threads);
lpfc_max_luns_init(vport, lpfc_max_luns);