diff options
| author | James Smart <jsmart2021@gmail.com> | 2018-07-31 17:23:22 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-08-02 15:45:19 -0400 |
| commit | 2a5b7d626ed2256fd0ef0e799ebc6ef47b7bd283 (patch) | |
| tree | 63fb5737e68253ae59db6fa2d5a46fab21b90b02 /drivers/scsi/lpfc/lpfc_nvme.h | |
| parent | 93a3922da428ec0752e8b2ab00c42dadbbf805a9 (diff) | |
scsi: lpfc: Limit tracking of tgt queue depth in fast path
Performance is affected when target queue depth is tracked. An atomic
counter is incremented on the submission path which competes with it being
decremented on the completion path. In addition, multiple CPUs can
simultaniously be manipulating this counter for the same ndlp.
Reduce the overhead by only performing the target increment/decrement when
the target queue depth is less than the overall adapter depth, thus is
actually meaningful.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_nvme.h')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_nvme.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nvme.h b/drivers/scsi/lpfc/lpfc_nvme.h index 04bd463dd043..cfd4719be25c 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.h +++ b/drivers/scsi/lpfc/lpfc_nvme.h @@ -86,6 +86,7 @@ struct lpfc_nvme_buf { uint16_t flags; /* TBD convert exch_busy to flags */ #define LPFC_SBUF_XBUSY 0x1 /* SLI4 hba reported XB on WCQE cmpl */ +#define LPFC_BUMP_QDEPTH 0x2 /* bumped queue depth counter */ uint16_t exch_busy; /* SLI4 hba reported XB on complete WCQE */ uint16_t status; /* From IOCB Word 7- ulpStatus */ uint16_t cpu; |