vhost/vsock: support MSG_ZEROCOPY for transport

Add 'msgzerocopy_allow()' callback for vhost transport.

Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 83711aad855c421bf82fcc8cb1c87861d2e35bef..f75731396b7eff89183783ac32b6866c4ae66c91 100644 (file)
--- 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,