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1# Copyright 2014 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5import common
6from autotest_lib.client.cros.cellular.mbim_compliance import mbim_constants
7from autotest_lib.client.cros.cellular.mbim_compliance import mbim_dts_test_base
8from autotest_lib.client.cros.cellular.mbim_compliance import mbim_errors
9from autotest_lib.client.cros.cellular.mbim_compliance.sequences \
10        import loopback_sequence
11
12
13class cellular_MbimComplianceDTS1521(mbim_dts_test_base.MbimDtsTestBase):
14    """
15    Validation of wLength.
16
17    This test validates the value in wLength field of NDP16/32.
18
19    Reference:
20        [1] Universal Serial Bus Communication Class MBIM Compliance Testing: 33
21        http://www.usb.org/developers/docs/devclass_docs/MBIM-Compliance-1.0.pdf
22
23    """
24    version = 1
25
26    def run_internal(self, ntb_format):
27        """
28        Run DTS_15/DTS_21 test.
29
30        @param ntb_format: Whether to send/receive an NTB16 or NTB32 frame.
31                Possible values: NTB_FORMAT_16, NTB_FORMAT_32 (mbim_constants)
32
33        """
34        # Precondition
35        _, _, _ = self.run_precondition(ntb_format)
36
37        # Step 1
38        loopback = loopback_sequence.LoopbackSequence(self.device_context)
39        _, ndp, _, _ = loopback.run(ntb_format=ntb_format)
40
41        # Step 2
42        if ntb_format == mbim_constants.NTB_FORMAT_16:
43            if (ndp.length < 16) or (ndp.length % 4 != 0):
44                mbim_errors.log_and_raise(
45                        mbim_errors.MBIMComplianceAssertionError,
46                        'ncm1.0:3.3.1#1')
47        else:
48            if (ndp.length < 32) or (ndp.length % 8 != 0):
49                mbim_errors.log_and_raise(
50                        mbim_errors.MBIMComplianceAssertionError,
51                        'ncm1.0:3.3.2#1')
52