[SCSI] lpfc 8.1.1 : Added code to adjust lun queue depth to avoid target overloading (445cf4f4) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/scsi/lpfc/lpfc.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -29,9 +29,10 @@ struct lpfc_sli2_slim;
		#define LPFC_LC_HBA_Q_DEPTH 1024 /* max cmds per low cost hba */
		#define LPFC_LP101_HBA_Q_DEPTH 128 /* max cmds per low cost hba */

		#define LPFC_CMD_PER_LUN 30 /* max outstanding cmds per lun */
		#define LPFC_CMD_PER_LUN 3 /* max outstanding cmds per lun */
		#define LPFC_SG_SEG_CNT 64 /* sg element count per scsi cmnd */
		#define LPFC_IOCB_LIST_CNT 2250 /* list of IOCBs for fast-path usage. */
		#define LPFC_Q_RAMP_UP_INTERVAL 120 /* lun q_depth ramp up interval */

		/* Define macros for 64 bit support */
		#define putPaddrLow(addr) ((uint32_t) (0xffffffff & (u64)(addr)))

drivers/scsi/lpfc/lpfc_disc.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -73,6 +73,8 @@ struct lpfc_nodelist {
		struct lpfc_hba *nlp_phba;
		struct lpfc_work_evt nodev_timeout_evt;
		struct lpfc_work_evt els_retry_evt;
		unsigned long last_ramp_up_time; /* jiffy of last ramp up */
		unsigned long last_q_full_time; /* jiffy of last queue full */
		};

		/* Defines for nlp_flag (uint32) */

drivers/scsi/lpfc/lpfc_scsi.c

+58 −0

Original line number	Diff line number	Diff line
		@@ -409,6 +409,9 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba phba, struct lpfc_iocbq pIocbIn,
		struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
		struct lpfc_nodelist *pnode = rdata->pnode;
		struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
		int result;
		struct scsi_device sdev, tmp_sdev;
		int depth = 0;

		lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
		lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
		@@ -460,8 +463,63 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba phba, struct lpfc_iocbq pIocbIn,
		lp, (lp + 3), cmd->retries, cmd->resid);
		}

		result = cmd->result;
		sdev = cmd->device;
		cmd->scsi_done(cmd);

		if (!result &&
		((jiffies - pnode->last_ramp_up_time) >
		LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
		((jiffies - pnode->last_q_full_time) >
		LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
		(phba->cfg_lun_queue_depth > sdev->queue_depth)) {
		shost_for_each_device(tmp_sdev, sdev->host) {
		if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
		if (tmp_sdev->id != sdev->id)
		continue;
		if (tmp_sdev->ordered_tags)
		scsi_adjust_queue_depth(tmp_sdev,
		MSG_ORDERED_TAG,
		tmp_sdev->queue_depth+1);
		else
		scsi_adjust_queue_depth(tmp_sdev,
		MSG_SIMPLE_TAG,
		tmp_sdev->queue_depth+1);

		pnode->last_ramp_up_time = jiffies;
		}
		}
		}

		/*
		* Check for queue full. If the lun is reporting queue full, then
		* back off the lun queue depth to prevent target overloads.
		*/
		if (result == SAM_STAT_TASK_SET_FULL) {
		pnode->last_q_full_time = jiffies;

		shost_for_each_device(tmp_sdev, sdev->host) {
		if (tmp_sdev->id != sdev->id)
		continue;
		depth = scsi_track_queue_full(tmp_sdev,
		tmp_sdev->queue_depth - 1);
		}
		/*
		* The queue depth cannot be lowered any more.
		* Modify the returned error code to store
		* the final depth value set by
		* scsi_track_queue_full.
		*/
		if (depth == -1)
		depth = sdev->host->cmd_per_lun;

		if (depth) {
		lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
		"%d:0711 detected queue full - lun queue depth "
		" adjusted to %d.\n", phba->brd_no, depth);
		}
		}

		lpfc_release_scsi_buf(phba, lpfc_cmd);
		}