diff options
| author | James Smart <jsmart2021@gmail.com> | 2019-08-14 16:57:05 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-08-19 22:41:11 -0400 |
| commit | 1df09449902d1d4023a46ad02eab16483c54c49b (patch) | |
| tree | c6abb8197c36d48caa7a4502cd8be0b4646446b7 /drivers/scsi/lpfc | |
| parent | d9f492a1a1ab2f3847e2c65b87a738f3831e6751 (diff) | |
scsi: lpfc: Add simple unlikely optimizations to reduce NVME latency
While performing code review, several relatively simple optimizations can
be done in the fast path.
Add these optimizations (unlikely designators).
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>
Diffstat (limited to 'drivers/scsi/lpfc')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_nvme.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index 41b124b69947..106aef82620d 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -999,9 +999,9 @@ lpfc_nvme_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn, idx = lpfc_ncmd->cur_iocbq.hba_wqidx; phba->sli4_hba.hdwq[idx].nvme_cstat.io_cmpls++; - if (vport->localport) { + if (unlikely(status && vport->localport)) { lport = (struct lpfc_nvme_lport *)vport->localport->private; - if (lport && status) { + if (lport) { if (bf_get(lpfc_wcqe_c_xb, wcqe)) atomic_inc(&lport->cmpl_fcp_xb); atomic_inc(&lport->cmpl_fcp_err); @@ -1141,7 +1141,7 @@ out_err: phba->ktime_last_cmd = lpfc_ncmd->ts_data_nvme; lpfc_nvme_ktime(phba, lpfc_ncmd); } - if (phba->cpucheck_on & LPFC_CHECK_NVME_IO) { + if (unlikely(phba->cpucheck_on & LPFC_CHECK_NVME_IO)) { uint32_t cpu; idx = lpfc_ncmd->cur_iocbq.hba_wqidx; cpu = raw_smp_processor_id(); @@ -1475,7 +1475,7 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport, goto out_fail; } - if (vport->load_flag & FC_UNLOADING) { + if (unlikely(vport->load_flag & FC_UNLOADING)) { lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR, "6124 Fail IO, Driver unload\n"); atomic_inc(&lport->xmt_fcp_err); |