From: Joyce Kong <joyce.kong@arm.com>
Date: Mon, 21 Dec 2020 14:23:20 +0000 (+0800)
Subject: net/virtio: replace full barrier with relaxed ones for Arm
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=e51a474ceda7fbdbb3c1b8ef37794496a86ccdf6;p=dpdk.git

net/virtio: replace full barrier with relaxed ones for Arm

Relax the full write barriers to one-way barriers for virtio
control path for Arm platform

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 9600624d08..92a3d4efa5 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -203,8 +203,8 @@ virtio_send_command_packed(struct virtnet_ctl *cvq,
 		vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
 	}
 
-	virtio_wmb(vq->hw->weak_barriers);
-	desc[head].flags = VRING_DESC_F_NEXT | flags;
+	virtqueue_store_flags_packed(&desc[head], VRING_DESC_F_NEXT | flags,
+			vq->hw->weak_barriers);
 
 	virtio_wmb(vq->hw->weak_barriers);
 	virtqueue_notify(vq);