VSOCK: handle VIRTIO_VSOCK_OP_CREDIT_REQUEST

The original implementation of the virtio-vsock driver does not
handle a VIRTIO_VSOCK_OP_CREDIT_REQUEST as required by the
virtio-vsock specification. The vsock device emulated by
vhost-vsock and the virtio-vsock driver never uses this request,
which was probably why nobody noticed it. However, another
implementation of the device may use this request type.

Hence, this commit introduces a way to handle an explicit credit
request by responding with a corresponding credit update as
required by the virtio-vsock specification.

Fixes: 06a8fc78367d ("VSOCK: Introduce virtio_vsock_common.ko")
Signed-off-by: Harshavardhan Unnibhavi <harshanavkis@gmail.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20210802173506.2383-1-harshanavkis@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 169ba8b..081e7ae 100644 (file)
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1079,6 +1079,9 @@ virtio_transport_recv_connected(struct sock *sk,
                virtio_transport_recv_enqueue(vsk, pkt);
                sk->sk_data_ready(sk);
                return err;
+       case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
+               virtio_transport_send_credit_update(vsk);
+               break;
        case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
                sk->sk_write_space(sk);
                break;