linux-kernel - Re: [PATCH RFC v5 12/13] vhost/vsock: switch to the buf API

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Date:   Mon, 8 Jun 2020 09:30:38 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>, eperezma@...hat.com,
        Stefan Hajnoczi <stefanha@...hat.com>
Subject: Re: [PATCH RFC v5 12/13] vhost/vsock: switch to the buf API

On Mon, Jun 08, 2020 at 12:17:46PM +0200, Stefano Garzarella wrote:
> On Sun, Jun 07, 2020 at 10:11:49AM -0400, Michael S. Tsirkin wrote:
> > A straight-forward conversion.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  drivers/vhost/vsock.c | 30 ++++++++++++++++++------------
> >  1 file changed, 18 insertions(+), 12 deletions(-)
> 
> The changes for vsock part LGTM:
> 
> Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
> 
> 
> I also did some tests with vhost-vsock (tools/testing/vsock/vsock_test
> and iperf-vsock), so for vsock:
> 
> Tested-by: Stefano Garzarella <sgarzare@...hat.com>
> 
> Thanks,
> Stefano

Re-testing v6 would be very much appreciated.

> > 
> > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> > index a483cec31d5c..61c6d3dd2ae3 100644
> > --- a/drivers/vhost/vsock.c
> > +++ b/drivers/vhost/vsock.c
> > @@ -103,7 +103,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> >  		unsigned out, in;
> >  		size_t nbytes;
> >  		size_t iov_len, payload_len;
> > -		int head;
> > +		struct vhost_buf buf;
> > +		int ret;
> >  
> >  		spin_lock_bh(&vsock->send_pkt_list_lock);
> >  		if (list_empty(&vsock->send_pkt_list)) {
> > @@ -117,16 +118,17 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> >  		list_del_init(&pkt->list);
> >  		spin_unlock_bh(&vsock->send_pkt_list_lock);
> >  
> > -		head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
> > -					 &out, &in, NULL, NULL);
> > -		if (head < 0) {
> > +		ret = vhost_get_avail_buf(vq, &buf,
> > +					  vq->iov, ARRAY_SIZE(vq->iov),
> > +					  &out, &in, NULL, NULL);
> > +		if (ret < 0) {
> >  			spin_lock_bh(&vsock->send_pkt_list_lock);
> >  			list_add(&pkt->list, &vsock->send_pkt_list);
> >  			spin_unlock_bh(&vsock->send_pkt_list_lock);
> >  			break;
> >  		}
> >  
> > -		if (head == vq->num) {
> > +		if (!ret) {
> >  			spin_lock_bh(&vsock->send_pkt_list_lock);
> >  			list_add(&pkt->list, &vsock->send_pkt_list);
> >  			spin_unlock_bh(&vsock->send_pkt_list_lock);
> > @@ -186,7 +188,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> >  		 */
> >  		virtio_transport_deliver_tap_pkt(pkt);
> >  
> > -		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
> > +		buf.in_len = sizeof(pkt->hdr) + payload_len;
> > +		vhost_put_used_buf(vq, &buf);
> >  		added = true;
> >  
> >  		pkt->off += payload_len;
> > @@ -440,7 +443,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> >  	struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
> >  						 dev);
> >  	struct virtio_vsock_pkt *pkt;
> > -	int head, pkts = 0, total_len = 0;
> > +	int ret, pkts = 0, total_len = 0;
> > +	struct vhost_buf buf;
> >  	unsigned int out, in;
> >  	bool added = false;
> >  
> > @@ -461,12 +465,13 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> >  			goto no_more_replies;
> >  		}
> >  
> > -		head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
> > -					 &out, &in, NULL, NULL);
> > -		if (head < 0)
> > +		ret = vhost_get_avail_buf(vq, &buf,
> > +					  vq->iov, ARRAY_SIZE(vq->iov),
> > +					  &out, &in, NULL, NULL);
> > +		if (ret < 0)
> >  			break;
> >  
> > -		if (head == vq->num) {
> > +		if (!ret) {
> >  			if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
> >  				vhost_disable_notify(&vsock->dev, vq);
> >  				continue;
> > @@ -494,7 +499,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> >  			virtio_transport_free_pkt(pkt);
> >  
> >  		len += sizeof(pkt->hdr);
> > -		vhost_add_used(vq, head, len);
> > +		buf.in_len = len;
> > +		vhost_put_used_buf(vq, &buf);
> >  		total_len += len;
> >  		added = true;
> >  	} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
> > -- 
> > MST
> >