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scsi: lpfc: Slight fast-path performance optimizations

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Slightly rework some error check code paths for better streamlining.

Added compiler unlikely hints to allow slightly better optimization of the
fast-path.

Removed a few pointer checks that were obviously already valid.

Link: https://lore.kernel.org/r/20191018211832.7917-9-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2019-10-18 14:18:24 -07:00 committed by Martin K. Petersen
parent f84f8f93f0
commit 22770cbabf
2 changed files with 10 additions and 9 deletions
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2
drivers/scsi/lpfc/lpfc_nvme.c
View File

@ -2093,7 +2093,7 @@ lpfc_release_nvme_buf(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_ncmd)
lpfc_ncmd->flags &= ~LPFC_SBUF_BUMP_QDEPTH;
qp = lpfc_ncmd->hdwq;
if (lpfc_ncmd->flags & LPFC_SBUF_XBUSY) {
if (unlikely(lpfc_ncmd->flags & LPFC_SBUF_XBUSY)) {
lpfc_printf_log(phba, KERN_INFO, LOG_NVME_ABTS,
"6310 XB release deferred for "
"ox_id x%x on reqtag x%x\n",

17
drivers/scsi/lpfc/lpfc_scsi.c
View File

@ -611,7 +611,7 @@ lpfc_get_scsi_buf_s3(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
}
spin_unlock_irqrestore(&phba->scsi_buf_list_get_lock, iflag);
if (lpfc_ndlp_check_qdepth(phba, ndlp) && lpfc_cmd) {
if (lpfc_ndlp_check_qdepth(phba, ndlp)) {
atomic_inc(&ndlp->cmd_pending);
lpfc_cmd->flags |= LPFC_SBUF_BUMP_QDEPTH;
}
@ -3826,7 +3826,7 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
phba->sli4_hba.hdwq[idx].scsi_cstat.io_cmpls++;
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
if (phba->cpucheck_on & LPFC_CHECK_SCSI_IO) {
if (unlikely(phba->cpucheck_on & LPFC_CHECK_SCSI_IO)) {
cpu = raw_smp_processor_id();
if (cpu < LPFC_CHECK_CPU_CNT && phba->sli4_hba.hdwq)
phba->sli4_hba.hdwq[idx].cpucheck_cmpl_io[cpu]++;
@ -3874,7 +3874,7 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
}
#endif
if (lpfc_cmd->status) {
if (unlikely(lpfc_cmd->status)) {
if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
(lpfc_cmd->result & IOERR_DRVR_MASK))
lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
@ -4615,17 +4615,18 @@ lpfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
}
if (err == 2) {
cmnd->result = DID_ERROR << 16;
goto out_fail_command_release_buf;
} else if (err) {
if (unlikely(err)) {
if (err == 2) {
cmnd->result = DID_ERROR << 16;
goto out_fail_command_release_buf;
}
goto out_host_busy_free_buf;
}
lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp);
#ifdef CONFIG_SCSI_LPFC_DEBUG_FS
if (phba->cpucheck_on & LPFC_CHECK_SCSI_IO) {
if (unlikely(phba->cpucheck_on & LPFC_CHECK_SCSI_IO)) {
cpu = raw_smp_processor_id();
if (cpu < LPFC_CHECK_CPU_CNT) {
struct lpfc_sli4_hdw_queue *hdwq =