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net: ethtool: Add attributes for cable test reports

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Add the attributes needed to report cable test results to userspace.
The reports are expected to be per twisted pair. A nested property per
pair can report the result of the cable test. A nested property can
also report the length of the cable to any fault.

v2:
Grammar fixes
Change length from u16 to u32
s/DEV/HEADER/g
Add status attributes
Rename pairs from numbers to letters.

v3:
Fixed example in document
Add ETHTOOL_A_CABLE_NEST_* enum
Add ETHTOOL_MSG_CABLE_TEST_NTF to documentation

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrew Lunn
2020-05-10 21:12:34 +02:00
committed by Jakub Kicinski
parent 11ca3c4261
commit b28efb930b
2 changed files with 100 additions and 0 deletions
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41
Documentation/networking/ethtool-netlink.rst
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@@ -236,6 +236,7 @@ Kernel to userspace:
``ETHTOOL_MSG_EEE_GET_REPLY`` EEE settings
``ETHTOOL_MSG_EEE_NTF`` EEE settings
``ETHTOOL_MSG_TSINFO_GET_REPLY`` timestamping info
``ETHTOOL_MSG_CABLE_TEST_NTF`` Cable test results
===================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
@@ -970,6 +971,46 @@ Request contents:
``ETHTOOL_A_CABLE_TEST_HEADER`` nested request header
==================================== ====== ==========================
Notification contents:
An Ethernet cable typically contains 1, 2 or 4 pairs. The length of
the pair can only be measured when there is a fault in the pair and
hence a reflection. Information about the fault may not be available,
depending on the specific hardware. Hence the contents of the notify
message are mostly optional. The attributes can be repeated an
arbitrary number of times, in an arbitrary order, for an arbitrary
number of pairs.
The example shows the notification sent when the test is completed for
a T2 cable, i.e. two pairs. One pair is OK and hence has no length
information. The second pair has a fault and does have length
information.
+---------------------------------------------+--------+---------------------+
| ``ETHTOOL_A_CABLE_TEST_HEADER`` | nested | reply header |
+---------------------------------------------+--------+---------------------+
| ``ETHTOOL_A_CABLE_TEST_STATUS`` | u8 | completed |
+---------------------------------------------+--------+---------------------+
| ``ETHTOOL_A_CABLE_TEST_NTF_NEST`` | nested | all the results |
+-+-------------------------------------------+--------+---------------------+
| | ``ETHTOOL_A_CABLE_NEST_RESULT`` | nested | cable test result |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_RESULTS_PAIR`` | u8 | pair number |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_RESULTS_CODE`` | u8 | result code |
+-+-+-----------------------------------------+--------+---------------------+
| | ``ETHTOOL_A_CABLE_NEST_RESULT`` | nested | cable test results |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_RESULTS_PAIR`` | u8 | pair number |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_RESULTS_CODE`` | u8 | result code |
+-+-+-----------------------------------------+--------+---------------------+
| | ``ETHTOOL_A_CABLE_NEST_FAULT_LENGTH`` | nested | cable length |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_FAULT_LENGTH_PAIR`` | u8 | pair number |
+-+-+-----------------------------------------+--------+---------------------+
| | | ``ETHTOOL_A_CABLE_FAULT_LENGTH_CM`` | u32 | length in cm |
+-+-+-----------------------------------------+--------+---------------------+
Request translation
===================