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

Yang, Zhiyong zhiyong.yang at intel.com
Wed Apr 4 11:59:09 CEST 2018



> -----Original Message-----
> From: Bie, Tiwei
> Sent: Wednesday, April 4, 2018 1:37 PM
> To: Yang, Zhiyong <zhiyong.yang at intel.com>
> Cc: Tan, Jianfeng <jianfeng.tan at intel.com>; dev at dpdk.org;
> maxime.coquelin at redhat.com; thomas at monjalon.net; Wang, Zhihong
> <zhihong.wang at intel.com>
> Subject: Re: [PATCH v4 1/1] net/virtio-user: add support for server mode
> 
> On Tue, Apr 03, 2018 at 11:16:26PM +0800, Tan, Jianfeng wrote:
> > On 4/3/2018 8:20 PM, zhiyong.yang at 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));
> 

Ok, thanks, tiwei.


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