diff options
| author | James Smart <James.Smart@Emulex.Com> | 2008-09-07 11:52:04 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-10-13 09:28:57 -0400 |
| commit | 977b5a0af6d22a1a0170057c19cde37eeac68acd (patch) | |
| tree | 247128ab00aa554eca5366ff8fb3505930729eaf /drivers/scsi/lpfc/lpfc_scsi.c | |
| parent | b522d7d42d7ce843885d4c6740c5bd50876a2971 (diff) | |
[SCSI] lpfc 8.2.8 v2 : Add sysfs control of target queue depth handling
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>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_scsi.c')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_scsi.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index 72eef7e4a89..7b17f52660b 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -628,6 +628,7 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn, lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4]; lpfc_cmd->status = pIocbOut->iocb.ulpStatus; + atomic_dec(&pnode->cmd_pending); if (lpfc_cmd->status) { if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT && @@ -688,6 +689,29 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn, result = cmd->result; sdev = cmd->device; + if (vport->cfg_max_scsicmpl_time && + time_after(jiffies, lpfc_cmd->start_time + + msecs_to_jiffies(vport->cfg_max_scsicmpl_time))) { + spin_lock_irqsave(sdev->host->host_lock, flags); + if ((pnode->cmd_qdepth > atomic_read(&pnode->cmd_pending) && + (atomic_read(&pnode->cmd_pending) > LPFC_MIN_TGT_QDEPTH) && + ((cmd->cmnd[0] == READ_10) || (cmd->cmnd[0] == WRITE_10)))) + pnode->cmd_qdepth = atomic_read(&pnode->cmd_pending); + + pnode->last_change_time = jiffies; + spin_unlock_irqrestore(sdev->host->host_lock, flags); + } else if ((pnode->cmd_qdepth < LPFC_MAX_TGT_QDEPTH) && + time_after(jiffies, pnode->last_change_time + + msecs_to_jiffies(LPFC_TGTQ_INTERVAL))) { + spin_lock_irqsave(sdev->host->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; + pnode->last_change_time = jiffies; + spin_unlock_irqrestore(sdev->host->host_lock, flags); + } + lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd); cmd->scsi_done(cmd); @@ -1075,6 +1099,8 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *)) cmnd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0); goto out_fail_command; } + if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth) + goto out_host_busy; lpfc_cmd = lpfc_get_scsi_buf(phba); if (lpfc_cmd == NULL) { @@ -1093,6 +1119,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *)) lpfc_cmd->pCmd = cmnd; lpfc_cmd->rdata = rdata; lpfc_cmd->timeout = 0; + lpfc_cmd->start_time = jiffies; cmnd->host_scribble = (unsigned char *)lpfc_cmd; cmnd->scsi_done = done; @@ -1102,6 +1129,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *)) lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp); + atomic_inc(&ndlp->cmd_pending); err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring], &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB); if (err) @@ -1116,6 +1144,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *)) return 0; out_host_busy_free_buf: + atomic_dec(&ndlp->cmd_pending); lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd); lpfc_release_scsi_buf(phba, lpfc_cmd); out_host_busy: |