From: Matan Azrad <matan@mellanox.com>
Date: Mon, 29 Jun 2020 14:08:17 +0000 (+0000)
Subject: vhost: skip access lock when vDPA is configured
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=9f2016b2cee95fecb5356dc15711de8532b63b54

vhost: skip access lock when vDPA is configured

No need to take access lock in the vhost-user message handler when
vDPA driver controls all the data-path of the vhost device.

It allows the vDPA set_vring_state operation callback to configure
guest notifications.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
---

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index c08f506c1f..4349506719 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2683,8 +2683,10 @@ vhost_user_msg_handler(int vid, int fd)
 	case VHOST_USER_SEND_RARP:
 	case VHOST_USER_NET_SET_MTU:
 	case VHOST_USER_SET_SLAVE_REQ_FD:
-		vhost_user_lock_all_queue_pairs(dev);
-		unlock_required = 1;
+		if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
+			vhost_user_lock_all_queue_pairs(dev);
+			unlock_required = 1;
+		}
 		break;
 	default:
 		break;