EFSYS_OPT_EV_PREFECT allows to enable event prefetching
when event queue is polled.
>From Solarflare Communications Inc.
Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
drivers/net/sfc/efx/base/efx.h | 9 +++++++++
drivers/net/sfc/efx/base/efx_check.h | 7 +++++++
drivers/net/sfc/efx/base/efx_ev.c | 38 ++++++++++++++++++++++++++++++++++++
3 files changed, 54 insertions(+)
diff --git a/drivers/net/sfc/efx/base/efx.h b/drivers/net/sfc/efx/base/efx.h
index c06c9b6..24b7c8d 100644
--- a/drivers/net/sfc/efx/base/efx.h
+++ b/drivers/net/sfc/efx/base/efx.h
@@ -1317,6 +1317,15 @@ efx_ev_qpending(
__in efx_evq_t *eep,
__in unsigned int count);
+#if EFSYS_OPT_EV_PREFETCH
+
+extern void
+efx_ev_qprefetch(
+ __in efx_evq_t *eep,
+ __in unsigned int count);
+
+#endif /* EFSYS_OPT_EV_PREFETCH */
+
extern void
efx_ev_qpoll(
__in efx_evq_t *eep,
diff --git a/drivers/net/sfc/efx/base/efx_check.h
b/drivers/net/sfc/efx/base/efx_check.h
index 5956052..df46410 100644
--- a/drivers/net/sfc/efx/base/efx_check.h
+++ b/drivers/net/sfc/efx/base/efx_check.h
@@ -66,6 +66,13 @@
# endif
#endif /* EFSYS_OPT_DIAG */
+#if EFSYS_OPT_EV_PREFETCH
+/* Support optimized EVQ data access */
+# if !(EFSYS_OPT_SIENA || EFSYS_OPT_HUNTINGTON || EFSYS_OPT_MEDFORD)
+# error "EV_PREFETCH requires SIENA or HUNTINGTON or MEDFORD"
+# endif
+#endif /* EFSYS_OPT_EV_PREFETCH */
+
#ifdef EFSYS_OPT_FALCON_NIC_CFG_OVERRIDE
# error "FALCON_NIC_CFG_OVERRIDE is obsolete and is not supported."
#endif
diff --git a/drivers/net/sfc/efx/base/efx_ev.c
b/drivers/net/sfc/efx/base/efx_ev.c
index 74d146e..c172a06 100644
--- a/drivers/net/sfc/efx/base/efx_ev.c
+++ b/drivers/net/sfc/efx/base/efx_ev.c
@@ -351,6 +351,23 @@ efx_ev_qpending(
return (EFX_EV_PRESENT(qword));
}
+#if EFSYS_OPT_EV_PREFETCH
+
+ void
+efx_ev_qprefetch(
+ __in efx_evq_t *eep,
+ __in unsigned int count)
+{
+ unsigned int offset;
+
+ EFSYS_ASSERT3U(eep->ee_magic, ==, EFX_EVQ_MAGIC);
+
+ offset = (count & eep->ee_mask) * sizeof (efx_qword_t);
+ EFSYS_MEM_PREFETCH(eep->ee_esmp, offset);
+}
+
+#endif /* EFSYS_OPT_EV_PREFETCH */
+
#define EFX_EV_BATCH 8
void
@@ -403,11 +420,32 @@ efx_ev_qpoll(
offset += sizeof (efx_qword_t);
}
+#if EFSYS_OPT_EV_PREFETCH && (EFSYS_OPT_EV_PREFETCH_PERIOD > 1)
+ /*
+ * Prefetch the next batch when we get within PREFETCH_PERIOD
+ * of a completed batch. If the batch is smaller, then prefetch
+ * immediately.
+ */
+ if (total == batch && total < EFSYS_OPT_EV_PREFETCH_PERIOD)
+ EFSYS_MEM_PREFETCH(eep->ee_esmp, offset);
+#endif /* EFSYS_OPT_EV_PREFETCH */
+
/* Process the batch of events */
for (index = 0; index < total; ++index) {
boolean_t should_abort;
uint32_t code;
+#if EFSYS_OPT_EV_PREFETCH
+ /* Prefetch if we've now reached the batch period */
+ if (total == batch &&
+ index + EFSYS_OPT_EV_PREFETCH_PERIOD == total) {
+ offset = (count + batch) & eep->ee_mask;
+ offset *= sizeof (efx_qword_t);
+
+ EFSYS_MEM_PREFETCH(eep->ee_esmp, offset);
+ }
+#endif /* EFSYS_OPT_EV_PREFETCH */
+
EFX_EV_QSTAT_INCR(eep, EV_ALL);
code = EFX_QWORD_FIELD(ev[index], FSF_AZ_EV_CODE);
--
2.5.5
