netdev - Re: [PATCH 2/3] vhost/vsock: support for SOCK

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Message-ID: <20201230155410-mutt-send-email-mst@kernel.org>
Date:   Wed, 30 Dec 2020 15:55:58 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Arseny Krasnov <arseny.krasnov@...persky.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] vhost/vsock: support for SOCK_SEQPACKET socket.

On Tue, Dec 29, 2020 at 02:06:33PM +0300, Arseny Krasnov wrote:
> 	This patch simply adds transport ops and removes
> ignore of non-stream type of packets.
> 
> Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>

How is this supposed to work? virtio vsock at the moment
has byte level end to end credit accounting at the
protocol level. I suspect some protocol changes involving
more than this tweak would
be needed to properly support anything that isn't a stream.

> ---
>  drivers/vhost/vsock.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index a483cec31d5c..4a36ef1c52d0 100644
> --- a/drivers/vhost/vsock.c
> +++ b/drivers/vhost/vsock.c
> @@ -346,8 +346,7 @@ vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
>  		return NULL;
>  	}
>  
> -	if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
> -		pkt->len = le32_to_cpu(pkt->hdr.len);
> +	pkt->len = le32_to_cpu(pkt->hdr.len);
>  
>  	/* No payload */
>  	if (!pkt->len)
> @@ -416,6 +415,9 @@ static struct virtio_transport vhost_transport = {
>  		.stream_is_active         = virtio_transport_stream_is_active,
>  		.stream_allow             = virtio_transport_stream_allow,
>  
> +		.seqpacket_seq_send_len	  = virtio_transport_seqpacket_seq_send_len,
> +		.seqpacket_seq_get_len	  = virtio_transport_seqpacket_seq_get_len,
> +
>  		.notify_poll_in           = virtio_transport_notify_poll_in,
>  		.notify_poll_out          = virtio_transport_notify_poll_out,
>  		.notify_recv_init         = virtio_transport_notify_recv_init,
> -- 
> 2.25.1