[dpdk-dev] [PATCH 1/3] bus/fslmc: create function to prefetch next DQRR entry

[Nipun Gupta <nipun.gupta@nxp.com>]

Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>
---
 drivers/bus/fslmc/qbman/include/fsl_qbman_portal.h |  6 ++++++
 drivers/bus/fslmc/qbman/qbman_portal.c             | 11 +++++++++++
 drivers/bus/fslmc/rte_bus_fslmc_version.map        |  1 +
 3 files changed, 18 insertions(+)

diff --git a/drivers/bus/fslmc/qbman/include/fsl_qbman_portal.h b/drivers/bus/fslmc/qbman/include/fsl_qbman_portal.h
index 95d785f..3e63db3 100644
--- a/drivers/bus/fslmc/qbman/include/fsl_qbman_portal.h
+++ b/drivers/bus/fslmc/qbman/include/fsl_qbman_portal.h
@@ -381,6 +381,12 @@ void qbman_pull_desc_set_channel(struct qbman_pull_desc *d, uint32_t chid,
 const struct qbman_result *qbman_swp_dqrr_next(struct qbman_swp *p);
 
 /**
+ * qbman_swp_prefetch_dqrr_next() - prefetch the next DQRR entry.
+ * @s: the software portal object.
+ */
+void qbman_swp_prefetch_dqrr_next(struct qbman_swp *s);
+
+/**
  * qbman_swp_dqrr_consume() -  Consume DQRR entries previously returned from
  * qbman_swp_dqrr_next().
  * @s: the software portal object.
diff --git a/drivers/bus/fslmc/qbman/qbman_portal.c b/drivers/bus/fslmc/qbman/qbman_portal.c
index 2d324f7..e221733 100644
--- a/drivers/bus/fslmc/qbman/qbman_portal.c
+++ b/drivers/bus/fslmc/qbman/qbman_portal.c
@@ -779,6 +779,17 @@ int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 #define QBMAN_RESULT_BPSCN     0x29
 #define QBMAN_RESULT_CSCN_WQ   0x2a
 
+#include <rte_prefetch.h>
+
+void qbman_swp_prefetch_dqrr_next(struct qbman_swp *s)
+{
+	const struct qbman_result *p;
+
+	p = qbman_cena_read_wo_shadow(&s->sys,
+		QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
+	rte_prefetch0(p);
+}
+
 /* NULL return if there are no unconsumed DQRR entries. Returns a DQRR entry
  * only once, so repeated calls can return a sequence of DQRR entries, without
  * requiring they be consumed immediately or in any particular order.
diff --git a/drivers/bus/fslmc/rte_bus_fslmc_version.map b/drivers/bus/fslmc/rte_bus_fslmc_version.map
index 09ec05f..3f1ba13 100644
--- a/drivers/bus/fslmc/rte_bus_fslmc_version.map
+++ b/drivers/bus/fslmc/rte_bus_fslmc_version.map
@@ -99,6 +99,7 @@ DPDK_18.02 {
 	qbman_fq_query_state;
 	qbman_fq_state_frame_count;
 	qbman_swp_dqrr_idx_consume;
+	qbman_swp_prefetch_dqrr_next;
 	rte_fslmc_get_device_count;
 
 } DPDK_17.11;
-- 
1.9.1