[dpdk-dev] [PATCH v1 2/8] examples/vhost_blk: replace smp with thread fence

[Joyce Kong <joyce.kong@arm.com>]

Simply replace the rte_smp_mb barriers with SEQ_CST atomic thread fence,
if there is no load/store operations.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 examples/vhost_blk/vhost_blk.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/vhost_blk/vhost_blk.c b/examples/vhost_blk/vhost_blk.c
index bb293d492..7ea60863d 100644
--- a/examples/vhost_blk/vhost_blk.c
+++ b/examples/vhost_blk/vhost_blk.c
@@ -86,9 +86,9 @@ enqueue_task(struct vhost_blk_task *task)
 	 */
 	used->ring[used->idx & (vq->vring.size - 1)].id = task->req_idx;
 	used->ring[used->idx & (vq->vring.size - 1)].len = task->data_len;
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 	used->idx++;
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 
 	rte_vhost_clr_inflight_desc_split(task->ctrlr->vid,
 		vq->id, used->idx, task->req_idx);
@@ -112,12 +112,12 @@ enqueue_task_packed(struct vhost_blk_task *task)
 	desc->id = task->buffer_id;
 	desc->addr = 0;
 
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 	if (vq->used_wrap_counter)
 		desc->flags |= VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED;
 	else
 		desc->flags &= ~(VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 
 	rte_vhost_clr_inflight_desc_packed(task->ctrlr->vid, vq->id,
 					   task->inflight_idx);
-- 
2.29.2