cancel

    pub fn cancel(self: *Ip6, token: ?*CompletionToken) CancelError!void {
        switch (self._cancel(self, token)) {
            .success => {},
            .invalid_parameter => return error.InvalidParameter,
            .not_started => return error.NotStarted,
            .not_found => return error.NotFound,
            .device_error => return error.DeviceError,
            else => |status| return uefi.unexpectedStatus(status),
        }
    }