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Commit 7dc517df authored by James Smart's avatar James Smart Committed by James Bottomley
Browse files

[SCSI] lpfc 8.3.15: Add target queue depth throttling 



Signed-off-by: default avatarAlex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: default avatarJames Smart <james.smart@emulex.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 3804dc84

drivers/scsi/lpfc/lpfc.h

+2 −1
Original line number Diff line number Diff line
@@ -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;

drivers/scsi/lpfc/lpfc_attr.c

+11 −1
Original line number Diff line number Diff line
@@ -2207,6 +2207,13 @@ LPFC_VPORT_ATTR_R(enable_da_id, 0, 0, 1, 
LPFC_VPORT_ATTR_R(lun_queue_depth, 30, 1, 128,

		  "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
@@ -3122,7 +3129,7 @@ lpfc_max_scsicmpl_time_set(struct lpfc_vport *vport, int val) 
			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_attrs[] = { 
	&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_vport *vport) 
{

	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);

drivers/scsi/lpfc/lpfc_hbadisc.c

+1 −1
Original line number Diff line number Diff line
@@ -3583,7 +3583,7 @@ lpfc_initialize_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp, 
	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 *

drivers/scsi/lpfc/lpfc_scsi.c

+8 −7
Original line number Diff line number Diff line
@@ -2458,14 +2458,16 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn, 
		}

		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, void (*done) (struct scsi_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);