Re: [dpdk-dev] [PATCH v4 1/1] net/virtio-user: add support for server mode

[Tiwei Bie <tiwei.bie@intel.com>]

On Tue, Apr 03, 2018 at 11:16:26PM +0800, Tan, Jianfeng wrote:
> On 4/3/2018 8:20 PM, zhiyong.yang@intel.com wrote:
[...]
> > @@ -267,21 +270,27 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
> >   	dev->vhostfds = NULL;
> >   	dev->tapfds = NULL;
> 
> Add a check here:
> if (dev->is_server && !is_vhost_user_by_type(dev->path))
>         return error;
> 
> > -	if (is_vhost_user_by_type(dev->path)) {
> > -		dev->ops = &ops_user;
> > +	if (dev->is_server) {
> > +		dev->ops = &ops_user;/* server mode only supports vhost user*/
> >   	} else {
> > -		dev->ops = &ops_kernel;
> > -
> > -		dev->vhostfds = malloc(dev->max_queue_pairs * sizeof(int));
> > -		dev->tapfds = malloc(dev->max_queue_pairs * sizeof(int));
> > -		if (!dev->vhostfds || !dev->tapfds) {
> > -			PMD_INIT_LOG(ERR, "Failed to malloc");
> > -			return -1;
> > -		}
> > -
> > -		for (q = 0; q < dev->max_queue_pairs; ++q) {
> > -			dev->vhostfds[q] = -1;
> > -			dev->tapfds[q] = -1;
> > +		if (is_vhost_user_by_type(dev->path)) {
> > +			dev->ops = &ops_user;
> > +		} else {
> > +			dev->ops = &ops_kernel;
> > +
> > +			dev->vhostfds = malloc(dev->max_queue_pairs *
> > +					       sizeof(int));
> > +			dev->tapfds = malloc(dev->max_queue_pairs *
> > +					     sizeof(int));
> > +			if (!dev->vhostfds || !dev->tapfds) {
> > +				PMD_INIT_LOG(ERR, "Failed to malloc");
> > +				return -1;
> > +			}
> > +
> > +			for (q = 0; q < dev->max_queue_pairs; ++q) {
> > +				dev->vhostfds[q] = -1;
> > +				dev->tapfds[q] = -1;
> > +			}
> >   		}
> >   	}

Hi Zhiyong,

I think we can keep using is_vhost_user_by_type() to
determine the ops for dev->ops. And you just need to
add a check in the vhost-kernel case. Something like
this:

--- i/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ w/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -270,6 +270,9 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
 	if (is_vhost_user_by_type(dev->path)) {
 		dev->ops = &ops_user;
 	} else {
+		if (dev->is_server)
+			return -1;
+
 		dev->ops = &ops_kernel;
 
 		dev->vhostfds = malloc(dev->max_queue_pairs * sizeof(int));


Thanks