vsock/virtio: support MSG_ZEROCOPY for transport

Add 'msgzerocopy_allow()' callback for virtio 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/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 09ba3128e7593d93f0cd16be4be9af5cac68b0ad..d324ae13e2f5ab1168ab03d86960b7d12b6b7b18 100644 (file)
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -486,6 +486,11 @@ static bool virtio_transport_can_msgzerocopy(int bufs_num)
        return res;
 }
 
+static bool virtio_transport_msgzerocopy_allow(void)
+{
+       return true;
+}
+
 static bool virtio_transport_seqpacket_allow(u32 remote_cid);
 
 static struct virtio_transport virtio_transport = {
@@ -519,6 +524,8 @@ static struct virtio_transport virtio_transport = {
                .seqpacket_allow          = virtio_transport_seqpacket_allow,
                .seqpacket_has_data       = virtio_transport_seqpacket_has_data,
 
+               .msgzerocopy_allow        = virtio_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,