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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>
This commit is contained in:
James Smart 2019-08-14 16:57:05 -07:00 committed by Martin K. Petersen
parent d9f492a1a1
commit 1df0944990
1 changed files with 4 additions and 4 deletions
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8
drivers/scsi/lpfc/lpfc_nvme.c
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@ -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);