Add target queue depth throttling
Signed-off-by: Alex Iannicelli <alex.iannicelli@xxxxxxxxxx>
Signed-off-by: James Smart <james.smart@xxxxxxxxxx>
---
lpfc.h | 3 ++-
lpfc_attr.c | 12 +++++++++++-
lpfc_hbadisc.c | 2 +-
lpfc_scsi.c | 15 ++++++++-------
4 files changed, 22 insertions(+), 10 deletions(-)
diff -upNr a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
--- a/drivers/scsi/lpfc/lpfc_attr.c 2010-07-09 00:49:14.000000000 -0400
+++ b/drivers/scsi/lpfc/lpfc_attr.c 2010-07-14 13:47:38.000000000 -0400
@@ -2208,6 +2208,13 @@ LPFC_VPORT_ATTR_R(lun_queue_depth, 30, 1
"Max number of FCP commands we can queue to a specific LUN");
/*
+# tgt_queue_depth: This parameter is used to limit the number of outstanding
+# commands per target port. Value range is [10,65535]. Default value is 65535.
+*/
+LPFC_VPORT_ATTR_R(tgt_queue_depth, 65535, 10, 65535,
+ "Max number of FCP commands we can queue to a specific target port");
+
+/*
# 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,
@@ -3122,7 +3129,7 @@ lpfc_max_scsicmpl_time_set(struct lpfc_v
continue;
if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
continue;
- ndlp->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
+ ndlp->cmd_qdepth = vport->cfg_tgt_queue_depth;
}
spin_unlock_irq(shost->host_lock);
return 0;
@@ -3326,6 +3333,7 @@ struct device_attribute *lpfc_hba_attrs[
&dev_attr_lpfc_temp_sensor,
&dev_attr_lpfc_log_verbose,
&dev_attr_lpfc_lun_queue_depth,
+ &dev_attr_lpfc_tgt_queue_depth,
&dev_attr_lpfc_hba_queue_depth,
&dev_attr_lpfc_peer_port_login,
&dev_attr_lpfc_nodev_tmo,
@@ -3387,6 +3395,7 @@ struct device_attribute *lpfc_vport_attr
&dev_attr_lpfc_drvr_version,
&dev_attr_lpfc_log_verbose,
&dev_attr_lpfc_lun_queue_depth,
+ &dev_attr_lpfc_tgt_queue_depth,
&dev_attr_lpfc_nodev_tmo,
&dev_attr_lpfc_devloss_tmo,
&dev_attr_lpfc_hba_queue_depth,
@@ -4575,6 +4584,7 @@ lpfc_get_vport_cfgparam(struct lpfc_vpor
{
lpfc_log_verbose_init(vport, lpfc_log_verbose);
lpfc_lun_queue_depth_init(vport, lpfc_lun_queue_depth);
+ lpfc_tgt_queue_depth_init(vport, lpfc_tgt_queue_depth);
lpfc_devloss_tmo_init(vport, lpfc_devloss_tmo);
lpfc_nodev_tmo_init(vport, lpfc_nodev_tmo);
lpfc_peer_port_login_init(vport, lpfc_peer_port_login);
diff -upNr a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
--- a/drivers/scsi/lpfc/lpfc.h 2010-07-09 00:49:14.000000000 -0400
+++ b/drivers/scsi/lpfc/lpfc.h 2010-07-14 13:47:38.000000000 -0400
@@ -48,7 +48,7 @@ struct lpfc_sli2_slim;
#define LPFC_TGTQ_INTERVAL 40000 /* Min amount of time between tgt
queue depth change in millisecs */
#define LPFC_TGTQ_RAMPUP_PCENT 5 /* Target queue rampup in percentage */
-#define LPFC_MIN_TGT_QDEPTH 100
+#define LPFC_MIN_TGT_QDEPTH 10
#define LPFC_MAX_TGT_QDEPTH 0xFFFF
#define LPFC_MAX_BUCKET_COUNT 20 /* Maximum no. of buckets for stat data
@@ -400,6 +400,7 @@ struct lpfc_vport {
uint32_t cfg_max_luns;
uint32_t cfg_enable_da_id;
uint32_t cfg_max_scsicmpl_time;
+ uint32_t cfg_tgt_queue_depth;
uint32_t dev_loss_tmo_changed;
diff -upNr a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c 2010-07-14 13:47:16.000000000 -0400
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c 2010-07-14 13:47:38.000000000 -0400
@@ -3583,7 +3583,7 @@ lpfc_initialize_node(struct lpfc_vport *
kref_init(&ndlp->kref);
NLP_INT_NODE_ACT(ndlp);
atomic_set(&ndlp->cmd_pending, 0);
- ndlp->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
+ ndlp->cmd_qdepth = vport->cfg_tgt_queue_depth;
}
struct lpfc_nodelist *
diff -upNr a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
--- a/drivers/scsi/lpfc/lpfc_scsi.c 2010-07-14 13:46:49.000000000 -0400
+++ b/drivers/scsi/lpfc/lpfc_scsi.c 2010-07-14 13:47:38.000000000 -0400
@@ -2458,14 +2458,16 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba
}
spin_unlock_irqrestore(shost->host_lock, flags);
} else if (pnode && NLP_CHK_NODE_ACT(pnode)) {
- if ((pnode->cmd_qdepth < LPFC_MAX_TGT_QDEPTH) &&
+ if ((pnode->cmd_qdepth < vport->cfg_tgt_queue_depth) &&
time_after(jiffies, pnode->last_change_time +
msecs_to_jiffies(LPFC_TGTQ_INTERVAL))) {
spin_lock_irqsave(shost->host_lock, flags);
- pnode->cmd_qdepth += pnode->cmd_qdepth *
- LPFC_TGTQ_RAMPUP_PCENT / 100;
- if (pnode->cmd_qdepth > LPFC_MAX_TGT_QDEPTH)
- pnode->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
+ depth = pnode->cmd_qdepth * LPFC_TGTQ_RAMPUP_PCENT
+ / 100;
+ depth = depth ? depth : 1;
+ pnode->cmd_qdepth += depth;
+ if (pnode->cmd_qdepth > vport->cfg_tgt_queue_depth)
+ pnode->cmd_qdepth = vport->cfg_tgt_queue_depth;
pnode->last_change_time = jiffies;
spin_unlock_irqrestore(shost->host_lock, flags);
}
@@ -2920,8 +2922,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd
cmnd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0);
goto out_fail_command;
}
- if (vport->cfg_max_scsicmpl_time &&
- (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth))
+ if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth)
goto out_host_busy;
lpfc_cmd = lpfc_get_scsi_buf(phba);
--
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