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[SCSI] lpfc 8.1.1 : Added code to adjust lun queue depth to avoid target overloading 

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James.Smart@Emulex.Com 2005-11-28 11:42:38 -05:00 committed by James Bottomley
parent 875fbdfe9b
commit 445cf4f4d2
3 changed files with 62 additions and 1 deletions
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3
drivers/scsi/lpfc/lpfc.h
View File

@ -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)))

2
drivers/scsi/lpfc/lpfc_disc.h
View File

@ -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) */

58
drivers/scsi/lpfc/lpfc_scsi.c
View File

@ -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);
}