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authorJames Smart <jsmart2021@gmail.com>2018-01-30 15:58:45 -0800
committerMartin K. Petersen <martin.petersen@oracle.com>2018-02-12 11:43:22 -0500
commit04673e38f56b30cd39b1fa0f386137d818b17781 (patch)
treec54093f177e6a73f17533b004b88ad854d56c595
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
scsi: lpfc: Fix frequency of Release WQE CQEs
The driver controls when the hardware sends completions that communicate consumption of elements from the WQ. This is done by setting a WQEC bit on a WQE. The current driver sets it on every Nth WQE posting. However, the driver isn't clearing the bit if the WQE is reused. Thus, if the queue depth isn't evenly divisible by N, with enough time, it can be set on every element, creating a lot of overhead and risking CQ full conditions. Correct by clearing the bit when not setting it on an Nth element. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--drivers/scsi/lpfc/lpfc_sli.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 5f5528a12308..149f21f53b13 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -129,6 +129,8 @@ lpfc_sli4_wq_put(struct lpfc_queue *q, union lpfc_wqe *wqe)
/* set consumption flag every once in a while */
if (!((q->host_index + 1) % q->entry_repost))
bf_set(wqe_wqec, &wqe->generic.wqe_com, 1);
+ else
+ bf_set(wqe_wqec, &wqe->generic.wqe_com, 0);
if (q->phba->sli3_options & LPFC_SLI4_PHWQ_ENABLED)
bf_set(wqe_wqid, &wqe->generic.wqe_com, q->queue_id);
lpfc_sli_pcimem_bcopy(wqe, temp_wqe, q->entry_size);