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Message-ID: <adeed3a8-68fe-bdb7-e4a1-48044dbe5436@gmail.com>
Date: Sat, 22 Jul 2023 11:45:29 +0300
From: Arseniy Krasnov <oxffffaa@...il.com>
To: Bobby Eshleman <bobby.eshleman@...edance.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Stefano Garzarella <sgarzare@...hat.com>, "Michael S. Tsirkin"
<mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, "David S. Miller"
<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
Dexuan Cui <decui@...rosoft.com>, Bryan Tan <bryantan@...are.com>,
Vishnu Dasa <vdasa@...are.com>,
VMware PV-Drivers Reviewers <pv-drivers@...are.com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
Simon Horman <simon.horman@...igine.com>, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
bpf@...r.kernel.org
Subject: Re: [PATCH RFC net-next v5 13/14] virtio/vsock: implement datagram
support
On 19.07.2023 03:50, Bobby Eshleman wrote:
> This commit implements datagram support for virtio/vsock by teaching
> virtio to use the general virtio transport ->dgram_addr_init() function
> and implementation a new version of ->dgram_allow().
>
> Additionally, it drops virtio_transport_dgram_allow() as an exported
> symbol because it is no longer used in other transports.
>
> Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
> ---
> include/linux/virtio_vsock.h | 1 -
> net/vmw_vsock/virtio_transport.c | 24 +++++++++++++++++++++++-
> net/vmw_vsock/virtio_transport_common.c | 6 ------
> 3 files changed, 23 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
> index b3856b8a42b3..d0a4f08b12c1 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -211,7 +211,6 @@ void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val);
> u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
> bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
> bool virtio_transport_stream_allow(u32 cid, u32 port);
> -bool virtio_transport_dgram_allow(u32 cid, u32 port);
> void virtio_transport_dgram_addr_init(struct sk_buff *skb,
> struct sockaddr_vm *addr);
>
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index ac2126c7dac5..713718861bd4 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -63,6 +63,7 @@ struct virtio_vsock {
>
> u32 guest_cid;
> bool seqpacket_allow;
> + bool dgram_allow;
> };
>
> static u32 virtio_transport_get_local_cid(void)
> @@ -413,6 +414,7 @@ static void virtio_vsock_rx_done(struct virtqueue *vq)
> queue_work(virtio_vsock_workqueue, &vsock->rx_work);
> }
>
> +static bool virtio_transport_dgram_allow(u32 cid, u32 port);
May be add body here? Without prototyping? Same for loopback and vhost.
> static bool virtio_transport_seqpacket_allow(u32 remote_cid);
>
> static struct virtio_transport virtio_transport = {
> @@ -430,6 +432,7 @@ static struct virtio_transport virtio_transport = {
>
> .dgram_enqueue = virtio_transport_dgram_enqueue,
> .dgram_allow = virtio_transport_dgram_allow,
> + .dgram_addr_init = virtio_transport_dgram_addr_init,
>
> .stream_dequeue = virtio_transport_stream_dequeue,
> .stream_enqueue = virtio_transport_stream_enqueue,
> @@ -462,6 +465,21 @@ static struct virtio_transport virtio_transport = {
> .send_pkt = virtio_transport_send_pkt,
> };
>
> +static bool virtio_transport_dgram_allow(u32 cid, u32 port)
> +{
> + struct virtio_vsock *vsock;
> + bool dgram_allow;
> +
> + dgram_allow = false;
> + rcu_read_lock();
> + vsock = rcu_dereference(the_virtio_vsock);
> + if (vsock)
> + dgram_allow = vsock->dgram_allow;
> + rcu_read_unlock();
> +
> + return dgram_allow;
> +}
> +
> static bool virtio_transport_seqpacket_allow(u32 remote_cid)
> {
> struct virtio_vsock *vsock;
> @@ -655,6 +673,9 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
> if (virtio_has_feature(vdev, VIRTIO_VSOCK_F_SEQPACKET))
> vsock->seqpacket_allow = true;
>
> + if (virtio_has_feature(vdev, VIRTIO_VSOCK_F_DGRAM))
> + vsock->dgram_allow = true;
> +
> vdev->priv = vsock;
>
> ret = virtio_vsock_vqs_init(vsock);
> @@ -747,7 +768,8 @@ static struct virtio_device_id id_table[] = {
> };
>
> static unsigned int features[] = {
> - VIRTIO_VSOCK_F_SEQPACKET
> + VIRTIO_VSOCK_F_SEQPACKET,
> + VIRTIO_VSOCK_F_DGRAM
> };
>
> static struct virtio_driver virtio_vsock_driver = {
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index 96118e258097..77898f5325cd 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -783,12 +783,6 @@ bool virtio_transport_stream_allow(u32 cid, u32 port)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_stream_allow);
>
> -bool virtio_transport_dgram_allow(u32 cid, u32 port)
> -{
> - return false;
> -}
> -EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow);
> -
> int virtio_transport_connect(struct vsock_sock *vsk)
> {
> struct virtio_vsock_pkt_info info = {
>
Thanks, Arseniy
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