[dpdk-dev] [PATCH] vhost: fix check peer close

[qikai <roland.qi@ucloud.cn>]

In process_slave_message_reply(), there is a
possibility that receiving a peer close
message instead of a real message response.

this patch targeting to handle the peer close
scenario and report the correct error message.

Signed-off-by: qikai <roland.qi@ucloud.cn>
---
 lib/librte_vhost/vhost_user.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index bd1be0104..971ccdb01 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2812,11 +2812,19 @@ static int process_slave_message_reply(struct virtio_net *dev,
 	if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
 		return 0;
 
-	if (read_vhost_message(dev->slave_req_fd, &msg_reply) < 0) {
+	ret = read_vhost_message(dev->slave_req_fd, &msg_reply);
+	if (ret <= 0) {
+		if (ret < 0)
+			VHOST_LOG_CONFIG(ERR,
+				"vhost read slave message reply failed\n");
+		else
+			VHOST_LOG_CONFIG(INFO,
+				"vhost peer closed\n");
 		ret = -1;
 		goto out;
 	}
 
+	ret = 0;
 	if (msg_reply.request.slave != msg->request.slave) {
 		VHOST_LOG_CONFIG(ERR,
 			"Received unexpected msg type (%u), expected %u\n",
-- 
2.23.0.windows.1