From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id EEB721B4ED; Thu, 11 Oct 2018 15:11:38 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Oct 2018 06:11:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,368,1534834800"; d="scan'208";a="99384570" Received: from btwcube1.sh.intel.com ([10.67.104.158]) by orsmga002.jf.intel.com with ESMTP; 11 Oct 2018 06:08:23 -0700 From: Tiwei Bie To: maxime.coquelin@redhat.com, zhihong.wang@intel.com, dev@dpdk.org Cc: mst@redhat.com, jasowang@redhat.com, stable@dpdk.org Date: Thu, 11 Oct 2018 21:06:55 +0800 Message-Id: <20181011130655.5485-1-tiwei.bie@intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH] vhost: fix notification for packed ring X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Oct 2018 13:11:39 -0000 The notification can't be disabled in packed ring when application tries to disable notification, because the device event flags field is overwritten by an unexpected value. This patch fixes this issue. Fixes: b1cce26af1dc ("vhost: add notification for packed ring") Cc: stable@dpdk.org Signed-off-by: Tiwei Bie --- lib/librte_vhost/vhost.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c index e62f4c594..c9270bdec 100644 --- a/lib/librte_vhost/vhost.c +++ b/lib/librte_vhost/vhost.c @@ -667,8 +667,10 @@ vhost_enable_notify_packed(struct virtio_net *dev, { uint16_t flags; - if (!enable) - vq->device_event->flags = VRING_EVENT_F_DISABLE; + if (!enable) { + flags = VRING_EVENT_F_DISABLE; + goto out; + } flags = VRING_EVENT_F_ENABLE; if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) { @@ -677,6 +679,7 @@ vhost_enable_notify_packed(struct virtio_net *dev, vq->avail_wrap_counter << 15; } +out: rte_smp_wmb(); vq->device_event->flags = flags; -- 2.19.1