linux-kernel - Re: [RFC PATCH v4 11/17] vsock/virtio: support MSG

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Date:   Mon, 26 Jun 2023 18:11:16 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v4 11/17] vsock/virtio: support MSG_ZEROCOPY for
 transport

On Sat, Jun 03, 2023 at 11:49:33PM +0300, Arseniy Krasnov wrote:
>Add 'msgzerocopy_allow()' callback for virtio transport.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> net/vmw_vsock/virtio_transport.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index 6053d8341091..d9ffa16dda69 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -438,6 +438,11 @@ static void virtio_vsock_rx_done(struct virtqueue *vq)
> 	queue_work(virtio_vsock_workqueue, &vsock->rx_work);
> }
>
>+static bool virtio_transport_msgzerocopy_allow(void)
>+{
>+	return true;
>+}
>+
> static bool virtio_transport_seqpacket_allow(u32 remote_cid);
>
> static struct virtio_transport virtio_transport = {
>@@ -484,6 +489,8 @@ static struct virtio_transport virtio_transport = {
> 		.notify_buffer_size       = virtio_transport_notify_buffer_size,
>
> 		.read_skb = virtio_transport_read_skb,
>+
>+		.msgzerocopy_allow        = virtio_transport_msgzerocopy_allow,

Ditto.

> 	},
>
> 	.send_pkt = virtio_transport_send_pkt,
>-- 
>2.25.1
>