Unable to perform cudnn convolution

[HVisMyLife]

Hello
I'm trying to setup convolution like that:

let input_desc = cudnn.create_4d_tensor::<f32>(sys::cudnnTensorFormat_t::CUDNN_TENSOR_NCHW, [1,1,64,64]).unwrap();
let output_desc = cudnn.create_4d_tensor::<f32>(sys::cudnnTensorFormat_t::CUDNN_TENSOR_NCHW, [1,1,64,64]).unwrap();
let filter_desc = cudnn.create_4d_filter::<f32>(sys::cudnnTensorFormat_t::CUDNN_TENSOR_NCHW, [1,1,1,1]).unwrap();
let mut convolution_desc = cudnn.create_conv2d::<f32>([0,0], [1,1], [1,1], sys::cudnnConvolutionMode_t::CUDNN_CONVOLUTION).unwrap();
convolution_desc.set_math_type(sys::cudnnMathType_t::CUDNN_DEFAULT_MATH).unwrap();
convolution_desc.set_group_count(1).unwrap();

let convolution = ConvForward {conv: &convolution_desc, x: &input_desc, w: &filter_desc, y: &output_desc};
let algo = convolution.pick_algorithm().unwrap();
let workspace_size = convolution.get_workspace_size(algo).unwrap();

let matrix = vec![0.5; 64*64];
let kernel = vec![0.2; 1];
let matrix_output = vec![0.0; 64*64];

let src = gpu.htod_copy(matrix).unwrap();
let filter = gpu.htod_copy(kernel).unwrap();
let mut dest = gpu.htod_copy(matrix_output).unwrap();
unsafe {
    let mut workspace = gpu.alloc_zeros::<u8>(workspace_size).unwrap();
    let mut workspace = workspace.transmute_mut::<u8>(workspace_size).unwrap();
    convolution.launch(algo, Some(&mut workspace), (1.,0.), &src, &filter, &mut dest).unwrap();
}

And it that form (with one element kernel) it works as expected, output is full of 0.1 (0.5*0.2).
However, as soon as I change kernel's dimensions to more than that (for example [1,1,3,3]) it throws CudnnError(CUDNN_STATUS_BAD_PARAM) at pick_algorithm()... What I'm doing wrong?

Thanks in advance