Fixed invalid mailbox timeouts
Signed-off-by: James Smart <james.smart@xxxxxxxxxx>
---
lpfc_sli.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
diff -upNr a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
--- a/drivers/scsi/lpfc/lpfc_sli.c 2013-10-09 17:25:28.940650536 -0400
+++ b/drivers/scsi/lpfc/lpfc_sli.c 2013-10-09 17:25:35.740650691 -0400
@@ -71,6 +71,8 @@ static int lpfc_sli4_post_els_sgl_list(s
int);
static void lpfc_sli4_hba_handle_eqe(struct lpfc_hba *, struct lpfc_eqe *,
uint32_t);
+static bool lpfc_sli4_mbox_completions_pending(struct lpfc_hba *phba);
+static bool lpfc_sli4_process_missed_mbox_completions(struct lpfc_hba *phba);
static IOCB_t *
lpfc_get_iocb_from_iocbq(struct lpfc_iocbq *iocbq)
@@ -6566,6 +6568,108 @@ lpfc_mbox_timeout(unsigned long ptr)
return;
}
+/**
+ * lpfc_sli4_mbox_completions_pending - check to see if any mailbox completions
+ * are pending
+ * @phba: Pointer to HBA context object.
+ *
+ * This function checks if any mailbox completions are present on the mailbox
+ * completion queue.
+ **/
+bool
+lpfc_sli4_mbox_completions_pending(struct lpfc_hba *phba)
+{
+
+ uint32_t idx;
+ struct lpfc_queue *mcq;
+ struct lpfc_mcqe *mcqe;
+ bool pending_completions = false;
+
+ if (unlikely(!phba) || (phba->sli_rev != LPFC_SLI_REV4))
+ return false;
+
+ /* Check for completions on mailbox completion queue */
+
+ mcq = phba->sli4_hba.mbx_cq;
+ idx = mcq->hba_index;
+ while (bf_get_le32(lpfc_cqe_valid, mcq->qe[idx].cqe)) {
+ mcqe = (struct lpfc_mcqe *)mcq->qe[idx].cqe;
+ if (bf_get_le32(lpfc_trailer_completed, mcqe) &&
+ (!bf_get_le32(lpfc_trailer_async, mcqe))) {
+ pending_completions = true;
+ break;
+ }
+ idx = (idx + 1) % mcq->entry_count;
+ if (mcq->hba_index == idx)
+ break;
+ }
+ return pending_completions;
+
+}
+
+/**
+ * lpfc_sli4_process_missed_mbox_completions - process mbox completions
+ * that were missed.
+ * @phba: Pointer to HBA context object.
+ *
+ * For sli4, it is possible to miss an interrupt. As such mbox completions
+ * maybe missed causing erroneous mailbox timeouts to occur. This function
+ * checks to see if mbox completions are on the mailbox completion queue
+ * and will process all the completions associated with the eq for the
+ * mailbox completion queue.
+ **/
+bool
+lpfc_sli4_process_missed_mbox_completions(struct lpfc_hba *phba)
+{
+
+ uint32_t eqidx;
+ struct lpfc_queue *fpeq = NULL;
+ struct lpfc_eqe *eqe;
+ bool mbox_pending;
+
+ if (unlikely(!phba) || (phba->sli_rev != LPFC_SLI_REV4))
+ return false;
+
+ /* Find the eq associated with the mcq */
+
+ if (phba->sli4_hba.hba_eq)
+ for (eqidx = 0; eqidx < phba->cfg_fcp_io_channel; eqidx++)
+ if (phba->sli4_hba.hba_eq[eqidx]->queue_id ==
+ phba->sli4_hba.mbx_cq->assoc_qid) {
+ fpeq = phba->sli4_hba.hba_eq[eqidx];
+ break;
+ }
+ if (!fpeq)
+ return false;
+
+ /* Turn off interrupts from this EQ */
+
+ lpfc_sli4_eq_clr_intr(fpeq);
+
+ /* Check to see if a mbox completion is pending */
+
+ mbox_pending = lpfc_sli4_mbox_completions_pending(phba);
+
+ /*
+ * If a mbox completion is pending, process all the events on EQ
+ * associated with the mbox completion queue (this could include
+ * mailbox commands, async events, els commands, receive queue data
+ * and fcp commands)
+ */
+
+ if (mbox_pending)
+ while ((eqe = lpfc_sli4_eq_get(fpeq))) {
+ lpfc_sli4_hba_handle_eqe(phba, eqe, eqidx);
+ fpeq->EQ_processed++;
+ }
+
+ /* Always clear and re-arm the EQ */
+
+ lpfc_sli4_eq_release(fpeq, LPFC_QUEUE_REARM);
+
+ return mbox_pending;
+
+}
/**
* lpfc_mbox_timeout_handler - Worker thread function to handle mailbox timeout
@@ -6583,6 +6687,10 @@ lpfc_mbox_timeout_handler(struct lpfc_hb
struct lpfc_sli *psli = &phba->sli;
struct lpfc_sli_ring *pring;
+ /* If the mailbox completed, process the completion and return */
+ if (lpfc_sli4_process_missed_mbox_completions(phba))
+ return;
+
/* Check the pmbox pointer first. There is a race condition
* between the mbox timeout handler getting executed in the
* worklist and the mailbox actually completing. When this
@@ -7077,6 +7185,10 @@ lpfc_sli4_async_mbox_block(struct lpfc_h
1000) + jiffies;
spin_unlock_irq(&phba->hbalock);
+ /* Make sure the mailbox is really active */
+ if (timeout)
+ lpfc_sli4_process_missed_mbox_completions(phba);
+
/* Wait for the outstnading mailbox command to complete */
while (phba->sli.mbox_active) {
/* Check active mailbox complete status every 2ms */
--
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