Add lpfc_fcp_look_ahead module parameter
Signed-off-by: James Smart <james.smart@xxxxxxxxxx>
---
lpfc.h | 2 +
lpfc_attr.c | 11 +++++++
lpfc_crtn.h | 1
lpfc_init.c | 3 ++
lpfc_sli.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
lpfc_sli4.h | 1
6 files changed, 102 insertions(+), 4 deletions(-)
diff -upNr a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
--- a/drivers/scsi/lpfc/lpfc_attr.c 2012-07-22 14:30:08.545267563 -0400
+++ b/drivers/scsi/lpfc/lpfc_attr.c 2012-07-22 14:32:56.345261734 -0400
@@ -3918,6 +3918,17 @@ LPFC_ATTR_R(enable_hba_heartbeat, 0, 0,
LPFC_ATTR_R(enable_bg, 0, 0, 1, "Enable BlockGuard Support");
/*
+# lpfc_fcp_look_ahead: Look ahead for completions in FCP start routine
+# 0 = disabled (default)
+# 1 = enabled
+# Value range is [0,1]. Default value is 0.
+*/
+unsigned int lpfc_fcp_look_ahead = LPFC_LOOK_AHEAD_OFF;
+
+module_param(lpfc_fcp_look_ahead, uint, S_IRUGO);
+MODULE_PARM_DESC(lpfc_fcp_look_ahead, "Look ahead for completions");
+
+/*
# lpfc_prot_mask: i
# - Bit mask of host protection capabilities used to register with the
# SCSI mid-layer
diff -upNr a/drivers/scsi/lpfc/lpfc_crtn.h b/drivers/scsi/lpfc/lpfc_crtn.h
--- a/drivers/scsi/lpfc/lpfc_crtn.h 2012-07-22 14:29:51.213268165 -0400
+++ b/drivers/scsi/lpfc/lpfc_crtn.h 2012-07-22 14:32:56.353261734 -0400
@@ -390,6 +390,7 @@ extern spinlock_t pgcnt_lock;
extern unsigned int pgcnt;
extern unsigned int lpfc_prot_mask;
extern unsigned char lpfc_prot_guard;
+extern unsigned int lpfc_fcp_look_ahead;
/* Interface exported by fabric iocb scheduler */
void lpfc_fabric_abort_nport(struct lpfc_nodelist *);
diff -upNr a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
--- a/drivers/scsi/lpfc/lpfc.h 2012-07-22 14:30:08.549267563 -0400
+++ b/drivers/scsi/lpfc/lpfc.h 2012-07-22 14:32:56.356261734 -0400
@@ -73,6 +73,8 @@ struct lpfc_sli2_slim;
#define LPFC_HB_MBOX_INTERVAL 5 /* Heart beat interval in seconds. */
#define LPFC_HB_MBOX_TIMEOUT 30 /* Heart beat timeout in seconds. */
+#define LPFC_LOOK_AHEAD_OFF 0 /* Look ahead logic is turned off */
+
/* Error Attention event polling interval */
#define LPFC_ERATT_POLL_INTERVAL 5 /* EATT poll interval in seconds */
diff -upNr a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
--- a/drivers/scsi/lpfc/lpfc_init.c 2012-07-22 14:29:51.443268157 -0400
+++ b/drivers/scsi/lpfc/lpfc_init.c 2012-07-22 14:32:56.370261734 -0400
@@ -8111,6 +8111,7 @@ enable_msix_vectors:
phba->sli4_hba.fcp_eq_hdl[index].idx = index;
phba->sli4_hba.fcp_eq_hdl[index].phba = phba;
+ atomic_set(&phba->sli4_hba.fcp_eq_hdl[index].fcp_eq_in_use, 1);
rc = request_irq(phba->sli4_hba.msix_entries[index].vector,
&lpfc_sli4_hba_intr_handler, IRQF_SHARED,
(char *)&phba->sli4_hba.handler_name[index],
@@ -8283,6 +8284,8 @@ lpfc_sli4_enable_intr(struct lpfc_hba *p
index++) {
phba->sli4_hba.fcp_eq_hdl[index].idx = index;
phba->sli4_hba.fcp_eq_hdl[index].phba = phba;
+ atomic_set(&phba->sli4_hba.fcp_eq_hdl[index].
+ fcp_eq_in_use, 1);
}
}
}
diff -upNr a/drivers/scsi/lpfc/lpfc_sli4.h b/drivers/scsi/lpfc/lpfc_sli4.h
--- a/drivers/scsi/lpfc/lpfc_sli4.h 2012-07-22 14:29:51.446268155 -0400
+++ b/drivers/scsi/lpfc/lpfc_sli4.h 2012-07-22 14:32:56.381261733 -0400
@@ -373,6 +373,7 @@ struct lpfc_hba;
struct lpfc_fcp_eq_hdl {
uint32_t idx;
struct lpfc_hba *phba;
+ atomic_t fcp_eq_in_use;
};
/* Port Capabilities for SLI4 Parameters */
diff -upNr a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
--- a/drivers/scsi/lpfc/lpfc_sli.c 2012-07-22 14:30:08.566267563 -0400
+++ b/drivers/scsi/lpfc/lpfc_sli.c 2012-07-22 14:32:56.396261733 -0400
@@ -69,6 +69,8 @@ static int lpfc_sli4_fp_handle_wcqe(stru
struct lpfc_cqe *);
static int lpfc_sli4_post_els_sgl_list(struct lpfc_hba *, struct list_head *,
int);
+static void lpfc_sli4_hba_handle_eqe(struct lpfc_hba *, struct lpfc_eqe *,
+ uint32_t);
static IOCB_t *
lpfc_get_iocb_from_iocbq(struct lpfc_iocbq *iocbq)
@@ -258,6 +260,25 @@ lpfc_sli4_eq_get(struct lpfc_queue *q)
}
/**
+ * lpfc_sli4_eq_clr_intr - Turn off interrupts from this EQ
+ * @q: The Event Queue to disable interrupts
+ *
+ **/
+static inline void
+lpfc_sli4_eq_clr_intr(struct lpfc_queue *q)
+{
+ struct lpfc_register doorbell;
+
+ doorbell.word0 = 0;
+ bf_set(lpfc_eqcq_doorbell_eqci, &doorbell, 1);
+ bf_set(lpfc_eqcq_doorbell_qt, &doorbell, LPFC_QUEUE_TYPE_EVENT);
+ bf_set(lpfc_eqcq_doorbell_eqid_hi, &doorbell,
+ (q->queue_id >> LPFC_EQID_HI_FIELD_SHIFT));
+ bf_set(lpfc_eqcq_doorbell_eqid_lo, &doorbell, q->queue_id);
+ writel(doorbell.word0, q->phba->sli4_hba.EQCQDBregaddr);
+}
+
+/**
* lpfc_sli4_eq_release - Indicates the host has finished processing an EQ
* @q: The Event Queue that the host has completed processing for.
* @arm: Indicates whether the host wants to arms this CQ.
@@ -8422,7 +8443,10 @@ int
lpfc_sli_issue_iocb(struct lpfc_hba *phba, uint32_t ring_number,
struct lpfc_iocbq *piocb, uint32_t flag)
{
+ struct lpfc_fcp_eq_hdl *fcp_eq_hdl;
struct lpfc_sli_ring *pring;
+ struct lpfc_queue *fpeq;
+ struct lpfc_eqe *eqe;
unsigned long iflags;
int rc, idx;
@@ -8433,11 +8457,48 @@ lpfc_sli_issue_iocb(struct lpfc_hba *phb
idx = lpfc_sli4_scmd_to_wqidx_distr(phba);
piocb->fcp_wqidx = idx;
ring_number = MAX_SLI3_CONFIGURED_RINGS + idx;
+
+ pring = &phba->sli.ring[ring_number];
+ spin_lock_irqsave(&pring->ring_lock, iflags);
+ rc = __lpfc_sli_issue_iocb(phba, ring_number, piocb,
+ flag);
+ spin_unlock_irqrestore(&pring->ring_lock, iflags);
+
+ if (lpfc_fcp_look_ahead) {
+ fcp_eq_hdl = &phba->sli4_hba.fcp_eq_hdl[idx];
+
+ if (atomic_dec_and_test(&fcp_eq_hdl->
+ fcp_eq_in_use)) {
+
+ /* Get associated EQ with this index */
+ fpeq = phba->sli4_hba.hba_eq[idx];
+
+ /* Turn off interrupts from this EQ */
+ lpfc_sli4_eq_clr_intr(fpeq);
+
+ /*
+ * Process all the events on FCP EQ
+ */
+ while ((eqe = lpfc_sli4_eq_get(fpeq))) {
+ lpfc_sli4_hba_handle_eqe(phba,
+ eqe, idx);
+ fpeq->EQ_processed++;
+ }
+
+ /* Always clear and re-arm the EQ */
+ lpfc_sli4_eq_release(fpeq,
+ LPFC_QUEUE_REARM);
+ }
+ atomic_inc(&fcp_eq_hdl->fcp_eq_in_use);
+ }
+ } else {
+ pring = &phba->sli.ring[ring_number];
+ spin_lock_irqsave(&pring->ring_lock, iflags);
+ rc = __lpfc_sli_issue_iocb(phba, ring_number, piocb,
+ flag);
+ spin_unlock_irqrestore(&pring->ring_lock, iflags);
+
}
- pring = &phba->sli.ring[ring_number];
- spin_lock_irqsave(&pring->ring_lock, iflags);
- rc = __lpfc_sli_issue_iocb(phba, ring_number, piocb, flag);
- spin_unlock_irqrestore(&pring->ring_lock, iflags);
} else {
/* For now, SLI2/3 will still use hbalock */
spin_lock_irqsave(&phba->hbalock, iflags);
@@ -11854,6 +11915,15 @@ lpfc_sli4_hba_intr_handler(int irq, void
if (unlikely(!fpeq))
return IRQ_NONE;
+ if (lpfc_fcp_look_ahead) {
+ if (atomic_dec_and_test(&fcp_eq_hdl->fcp_eq_in_use))
+ lpfc_sli4_eq_clr_intr(fpeq);
+ else {
+ atomic_inc(&fcp_eq_hdl->fcp_eq_in_use);
+ return IRQ_NONE;
+ }
+ }
+
/* Check device state for handling interrupt */
if (unlikely(lpfc_intr_state_check(phba))) {
fpeq->EQ_badstate++;
@@ -11863,6 +11933,8 @@ lpfc_sli4_hba_intr_handler(int irq, void
/* Flush, clear interrupt, and rearm the EQ */
lpfc_sli4_eq_flush(phba, fpeq);
spin_unlock_irqrestore(&phba->hbalock, iflag);
+ if (lpfc_fcp_look_ahead)
+ atomic_inc(&fcp_eq_hdl->fcp_eq_in_use);
return IRQ_NONE;
}
@@ -11885,6 +11957,12 @@ lpfc_sli4_hba_intr_handler(int irq, void
if (unlikely(ecount == 0)) {
fpeq->EQ_no_entry++;
+
+ if (lpfc_fcp_look_ahead) {
+ atomic_inc(&fcp_eq_hdl->fcp_eq_in_use);
+ return IRQ_NONE;
+ }
+
if (phba->intr_type == MSIX)
/* MSI-X treated interrupt served as no EQ share INT */
lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
@@ -11894,6 +11972,8 @@ lpfc_sli4_hba_intr_handler(int irq, void
return IRQ_NONE;
}
+ if (lpfc_fcp_look_ahead)
+ atomic_inc(&fcp_eq_hdl->fcp_eq_in_use);
return IRQ_HANDLED;
} /* lpfc_sli4_fp_intr_handler */
--
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