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Message-ID: <20200331141244-mutt-send-email-mst@kernel.org>
Date: Tue, 31 Mar 2020 14:14:23 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Eugenio Pérez <eperezma@...hat.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
kvm list <kvm@...r.kernel.org>,
Halil Pasic <pasic@...ux.ibm.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
Cornelia Huck <cohuck@...hat.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2 1/8] vhost: Create accessors for virtqueues
private_data
On Tue, Mar 31, 2020 at 07:59:59PM +0200, Eugenio Pérez wrote:
> Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
> ---
> drivers/vhost/net.c | 28 +++++++++++++++-------------
> drivers/vhost/vhost.h | 28 ++++++++++++++++++++++++++++
> drivers/vhost/vsock.c | 14 +++++++-------
> 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.
> + */
> +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);
I think I prefer vhost_vq_get_backend and vhost_vq_set_backend.
"opaque" just means that it's void * that is clear from the signature
anyway.
> 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
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