linux-kernel - Re: [RFC PATCH v5 10/17] vhost/vsock: support MSG

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Message-ID: <3y3emmciqa5ymphc3n5nw3infyiuty65ia7i4movyfmq7rodqb@cethro3rcyf6>
Date:   Thu, 6 Jul 2023 18:55:25 +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 v5 10/17] vhost/vsock: support MSG_ZEROCOPY for
 transport

On Sat, Jul 01, 2023 at 09:39:40AM +0300, Arseniy Krasnov wrote:
>Add 'msgzerocopy_allow()' callback for vhost transport.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> Changelog:
> v4 -> v5:
>  * Move 'msgzerocopy_allow' right after seqpacket callbacks.
>
> drivers/vhost/vsock.c | 7 +++++++
> 1 file changed, 7 insertions(+)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index cb00e0e059e4..3fd0ab0c0edc 100644
>--- a/drivers/vhost/vsock.c
>+++ b/drivers/vhost/vsock.c
>@@ -398,6 +398,11 @@ static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
> 	return val < vq->num;
> }
>
>+static bool vhost_transport_msgzerocopy_allow(void)
>+{
>+	return true;
>+}
>+
> static bool vhost_transport_seqpacket_allow(u32 remote_cid);
>
> static struct virtio_transport vhost_transport = {
>@@ -431,6 +436,8 @@ static struct virtio_transport vhost_transport = {
> 		.seqpacket_allow          = vhost_transport_seqpacket_allow,
> 		.seqpacket_has_data       = virtio_transport_seqpacket_has_data,
>
>+		.msgzerocopy_allow        = vhost_transport_msgzerocopy_allow,
>+
> 		.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
>