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From: Jiayu Hu <jiayu.hu@intel.com>
To: dev@dpdk.org
Cc: maxime.coquelin@redhat.com, chenbo.xia@intel.com,
	yinan.wang@intel.com, sunil.pai.g@intel.com,
	cheng1.jiang@intel.com, Jiayu Hu <jiayu.hu@intel.com>
Subject: [dpdk-dev] [PATCH v2 3/4] vhost: avoid deadlock on async register
Date: Fri,  2 Apr 2021 09:04:01 -0400	[thread overview]
Message-ID: <1617368642-131298-4-git-send-email-jiayu.hu@intel.com> (raw)
In-Reply-To: <1617368642-131298-1-git-send-email-jiayu.hu@intel.com>

Users can register async copy device in vring_state_changed(),
when vhost queue is enabled. However, a deadlock occurs inside
rte_vhost_async_channel_register(), if VHOST_USER_F_PROTOCOL_FEATURES
is not supported, as vhost_user_msg_handler() takes vq->access_lock
before calling vhost_user_set_vring_kick().

This patch avoids async register deadlock by removing calling
vring_state_changed() in vhost_user_set_vring_kick(). It's safe
as vhost_user_msg_handler() will call vring_state_changed() anyway.

Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
---
 lib/librte_vhost/vhost_user.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 44c0452..8f0eba6 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1918,9 +1918,6 @@ vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
 	 */
 	if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
 		vq->enabled = true;
-		if (dev->notify_ops->vring_state_changed)
-			dev->notify_ops->vring_state_changed(
-				dev->vid, file.index, 1);
 	}
 
 	if (vq->ready) {
-- 
2.7.4


  parent reply	other threads:[~2021-04-02  6:34 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17 12:56 [dpdk-dev] [PATCH 0/4] Refactor async vhost control path Jiayu Hu
2021-03-17 12:56 ` [dpdk-dev] [PATCH 1/4] vhost: fix uninitialized vhost queue Jiayu Hu
2021-03-26 15:14   ` Maxime Coquelin
2021-03-17 12:56 ` [dpdk-dev] [PATCH 2/4] vhost: remove unnecessary free Jiayu Hu
2021-03-29 15:03   ` Maxime Coquelin
2021-03-17 12:56 ` [dpdk-dev] [PATCH 3/4] vhost: avoid deadlock on async register Jiayu Hu
2021-03-29 15:19   ` Maxime Coquelin
2021-03-30  1:20     ` Hu, Jiayu
2021-04-13  9:37       ` Maxime Coquelin
2021-03-17 12:56 ` [dpdk-dev] [PATCH 4/4] doc: update async vhost register/unregister Jiayu Hu
2021-04-02 13:03 ` [dpdk-dev] [PATCH v2 0/4] Refactor async vhost control path Jiayu Hu
2021-04-02  8:06   ` Wang, Yinan
2021-04-02 13:03   ` [dpdk-dev] [PATCH v2 1/4] vhost: fix uninitialized vhost queue Jiayu Hu
2021-04-13 11:30     ` Maxime Coquelin
2021-04-02 13:04   ` [dpdk-dev] [PATCH v2 2/4] vhost: remove unnecessary free Jiayu Hu
2021-04-02 13:04   ` Jiayu Hu [this message]
2021-04-13 11:33     ` [dpdk-dev] [PATCH v2 3/4] vhost: avoid deadlock on async register Maxime Coquelin
2021-04-14  1:40       ` Hu, Jiayu
2021-04-14 10:08         ` Maxime Coquelin
2021-04-15  1:08           ` Hu, Jiayu
2021-04-15  7:09             ` Maxime Coquelin
2021-04-16  2:19               ` Hu, Jiayu
2021-04-16  6:35                 ` Maxime Coquelin
2021-04-16  8:18                   ` Hu, Jiayu
2021-04-16  8:33                     ` Maxime Coquelin
2021-04-19  4:10                       ` Hu, Jiayu
2021-04-19  7:13                         ` Maxime Coquelin
2021-04-19  9:02                           ` Hu, Jiayu
2021-04-02 13:04   ` [dpdk-dev] [PATCH v2 4/4] doc: update async vhost register/unregister Jiayu Hu
2021-04-20  8:57   ` [dpdk-dev] [PATCH v3 0/4] Refactor async vhost control path Jiayu Hu
2021-04-20  8:57     ` [dpdk-dev] [PATCH v3 1/4] vhost: fix uninitialized vhost queue Jiayu Hu
2021-04-20  8:57     ` [dpdk-dev] [PATCH v3 2/4] vhost: remove unnecessary free Jiayu Hu
2021-04-20  8:57     ` [dpdk-dev] [PATCH v3 3/4] vhost: fix unnecessary vring_state_changed call Jiayu Hu
2021-04-20  9:39       ` Maxime Coquelin
2021-04-21  1:36         ` Xia, Chenbo
2021-04-20  8:57     ` [dpdk-dev] [PATCH v3 4/4] doc: update async vhost register/unregister Jiayu Hu
2021-04-20  9:31       ` Maxime Coquelin
2021-04-28  2:05     ` [dpdk-dev] [PATCH v3 0/4] Refactor async vhost control path Xia, Chenbo

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