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

[Maxime Coquelin]

On 4/7/20 5:45 AM, qikai wrote:
> 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 at ucloud.cn>

Could you please provide you full name to be compliant with
the contribution guidelines?

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>


Thanks,
Maxime

> ---
>  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",
>