Re: [PATCH v2 1/8] vhost: Create accessors for virtqueues private_data

From: Eugenio Perez Martin
Date: Tue Mar 31 2020 - 15:29:08 EST

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On Tue, Mar 31, 2020 at 8:29 PM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
>
> On Tue, Mar 31, 2020 at 07:59:59PM +0200, Eugenio PÃrez wrote:
> > Signed-off-by: Eugenio PÃrez <eperezma@xxxxxxxxxx>
> > ---
> > drivers/vhost/net.c | 28 +++++++++++++++-------------
> > drivers/vhost/vhost.h | 28 ++++++++++++++++++++++++++++
> > drivers/vhost/vsock.c | 14 +++++++-------
>
>
> Seems to be missing scsi and test.

Good point, changing them too!

>
>
> > 3 files changed, 50 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> > index e158159671fa..6c5e7a6f712c 100644
> > --- a/drivers/vhost/net.c
> > +++ b/drivers/vhost/net.c
> > @@ -424,7 +424,7 @@ static void vhost_net_disable_vq(struct vhost_net *n,
> > struct vhost_net_virtqueue *nvq =
> > container_of(vq, struct vhost_net_virtqueue, vq);
> > struct vhost_poll *poll = n->poll + (nvq - n->vqs);
> > - if (!vq->private_data)
> > + if (!vhost_vq_get_backend_opaque(vq))
> > return;
> > vhost_poll_stop(poll);
> > }
> > @@ -437,7 +437,7 @@ static int vhost_net_enable_vq(struct vhost_net *n,
> > struct vhost_poll *poll = n->poll + (nvq - n->vqs);
> > struct socket *sock;
> >
> > - sock = vq->private_data;
> > + sock = vhost_vq_get_backend_opaque(vq);
> > if (!sock)
> > return 0;
> >
> > @@ -524,7 +524,7 @@ static void vhost_net_busy_poll(struct vhost_net *net,
> > return;
> >
> > vhost_disable_notify(&net->dev, vq);
> > - sock = rvq->private_data;
> > + sock = vhost_vq_get_backend_opaque(rvq);
> >
> > busyloop_timeout = poll_rx ? rvq->busyloop_timeout:
> > tvq->busyloop_timeout;
> > @@ -570,8 +570,10 @@ static int vhost_net_tx_get_vq_desc(struct vhost_net *net,
> >
> > if (r == tvq->num && tvq->busyloop_timeout) {
> > /* Flush batched packets first */
> > - if (!vhost_sock_zcopy(tvq->private_data))
> > - vhost_tx_batch(net, tnvq, tvq->private_data, msghdr);
> > + if (!vhost_sock_zcopy(vhost_vq_get_backend_opaque(tvq)))
> > + vhost_tx_batch(net, tnvq,
> > + vhost_vq_get_backend_opaque(tvq),
> > + msghdr);
> >
> > vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, false);
> >
> > @@ -685,7 +687,7 @@ static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq,
> > struct vhost_virtqueue *vq = &nvq->vq;
> > struct vhost_net *net = container_of(vq->dev, struct vhost_net,
> > dev);
> > - struct socket *sock = vq->private_data;
> > + struct socket *sock = vhost_vq_get_backend_opaque(vq);
> > struct page_frag *alloc_frag = &net->page_frag;
> > struct virtio_net_hdr *gso;
> > struct xdp_buff *xdp = &nvq->xdp[nvq->batched_xdp];
> > @@ -952,7 +954,7 @@ static void handle_tx(struct vhost_net *net)
> > struct socket *sock;
> >
> > mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX);
> > - sock = vq->private_data;
> > + sock = vhost_vq_get_backend_opaque(vq);
> > if (!sock)
> > goto out;
> >
> > @@ -1121,7 +1123,7 @@ static void handle_rx(struct vhost_net *net)
> > int recv_pkts = 0;
> >
> > mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX);
> > - sock = vq->private_data;
> > + sock = vhost_vq_get_backend_opaque(vq);
> > if (!sock)
> > goto out;
> >
> > @@ -1344,9 +1346,9 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n,
> > container_of(vq, struct vhost_net_virtqueue, vq);
> >
> > mutex_lock(&vq->mutex);
> > - sock = vq->private_data;
> > + sock = vhost_vq_get_backend_opaque(vq);
> > vhost_net_disable_vq(n, vq);
> > - vq->private_data = NULL;
> > + vhost_vq_set_backend_opaque(vq, NULL);
> > vhost_net_buf_unproduce(nvq);
> > nvq->rx_ring = NULL;
> > mutex_unlock(&vq->mutex);
> > @@ -1528,7 +1530,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
> > }
> >
> > /* start polling new socket */
> > - oldsock = vq->private_data;
> > + oldsock = vhost_vq_get_backend_opaque(vq);
> > if (sock != oldsock) {
> > ubufs = vhost_net_ubuf_alloc(vq,
> > sock && vhost_sock_zcopy(sock));
> > @@ -1538,7 +1540,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
> > }
> >
> > vhost_net_disable_vq(n, vq);
> > - vq->private_data = sock;
> > + vhost_vq_set_backend_opaque(vq, sock);
> > vhost_net_buf_unproduce(nvq);
> > r = vhost_vq_init_access(vq);
> > if (r)
> > @@ -1575,7 +1577,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
> > return 0;
> >
> > err_used:
> > - vq->private_data = oldsock;
> > + vhost_vq_set_backend_opaque(vq, oldsock);
> > vhost_net_enable_vq(n, vq);
> > if (ubufs)
> > vhost_net_ubuf_put_wait_and_free(ubufs);
> > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> > index a123fd70847e..0808188f7e8f 100644
> > --- a/drivers/vhost/vhost.h
> > +++ b/drivers/vhost/vhost.h
> > @@ -244,6 +244,34 @@ enum {
> > (1ULL << VIRTIO_F_VERSION_1)
> > };
> >
> > +/**
> > + * vhost_vq_set_backend_opaque - Set backend opaque.
> > + *
> > + * @vq Virtqueue.
> > + * @private_data The private data.
> > + *
> > + * Context: Need to call with vq->mutex acquired.
> > + */
> > +static inline void vhost_vq_set_backend_opaque(struct vhost_virtqueue *vq,
> > + void *private_data)
> > +{
> > + vq->private_data = private_data;
> > +}
> > +
> > +/**
> > + * vhost_vq_get_backend_opaque - Get backend opaque.
> > + *
> > + * @vq Virtqueue.
> > + * @private_data The private data.
> > + *
> > + * Context: Need to call with vq->mutex acquired.
> > + * Return: Opaque previously set with vhost_vq_set_backend_opaque.
>
>
> I prefer opaque -> private data in comments.
>

Changing.

v3 sent.

Thanks!

> > + */
>
>
>
>
> > +static inline void *vhost_vq_get_backend_opaque(struct vhost_virtqueue *vq)
> > +{
> > + return vq->private_data;
> > +}
> > +
> > static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
> > {
> > return vq->acked_features & (1ULL << bit);
> > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> > index c2d7d57e98cf..6e20dbe14acd 100644
> > --- a/drivers/vhost/vsock.c
> > +++ b/drivers/vhost/vsock.c
> > @@ -91,7 +91,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> >
> > mutex_lock(&vq->mutex);
> >
> > - if (!vq->private_data)
> > + if (!vhost_vq_get_backend_opaque(vq))
> > goto out;
> >
> > /* Avoid further vmexits, we're already processing the virtqueue */
> > @@ -440,7 +440,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> >
> > mutex_lock(&vq->mutex);
> >
> > - if (!vq->private_data)
> > + if (!vhost_vq_get_backend_opaque(vq))
> > goto out;
> >
> > vhost_disable_notify(&vsock->dev, vq);
> > @@ -533,8 +533,8 @@ static int vhost_vsock_start(struct vhost_vsock *vsock)
> > goto err_vq;
> > }
> >
> > - if (!vq->private_data) {
> > - vq->private_data = vsock;
> > + if (!vhost_vq_get_backend_opaque(vq)) {
> > + vhost_vq_set_backend_opaque(vq, vsock);
> > ret = vhost_vq_init_access(vq);
> > if (ret)
> > goto err_vq;
> > @@ -547,14 +547,14 @@ static int vhost_vsock_start(struct vhost_vsock *vsock)
> > return 0;
> >
> > err_vq:
> > - vq->private_data = NULL;
> > + vhost_vq_set_backend_opaque(vq, NULL);
> > mutex_unlock(&vq->mutex);
> >
> > for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
> > vq = &vsock->vqs[i];
> >
> > mutex_lock(&vq->mutex);
> > - vq->private_data = NULL;
> > + vhost_vq_set_backend_opaque(vq, NULL);
> > mutex_unlock(&vq->mutex);
> > }
> > err:
> > @@ -577,7 +577,7 @@ static int vhost_vsock_stop(struct vhost_vsock *vsock)
> > struct vhost_virtqueue *vq = &vsock->vqs[i];
> >
> > mutex_lock(&vq->mutex);
> > - vq->private_data = NULL;
> > + vhost_vq_set_backend_opaque(vq, NULL);
> > mutex_unlock(&vq->mutex);
> > }
> >
> > --
> > 2.18.1
>

Next message: Marek Szyprowski: "Re: [PATCH 2/2] ARM: DTS: Add devicetree file for the Galaxy S2"
Previous message: Eugenio PÃrez: "[PATCH v3 1/8] vhost: Create accessors for virtqueues private_data"
In reply to: Michael S. Tsirkin: "Re: [PATCH v2 1/8] vhost: Create accessors for virtqueues private_data"
Next in thread: Eugenio PÃrez: "[PATCH v2 2/8] vhost: option to fetch descriptors through an independent struct"
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