netdev - Re: [PATCH net-next v1 4/9] net: ethtool: Add attributes for cable test reports

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Date:   Sat, 25 Apr 2020 13:00:05 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH net-next v1 4/9] net: ethtool: Add attributes for cable
 test reports

Hi,
Here are a few edit comments for you to consider:

On 4/25/20 11:06 AM, Andrew Lunn wrote:
> 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.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
>  Documentation/networking/ethtool-netlink.rst | 35 +++++++++++++++
>  include/uapi/linux/ethtool_netlink.h         | 47 +++++++++++++++++++-
>  2 files changed, 81 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
> index 0c354567e991..89fd321b0e29 100644
> --- a/Documentation/networking/ethtool-netlink.rst
> +++ b/Documentation/networking/ethtool-netlink.rst
> @@ -967,6 +967,41 @@ Request contents:
>    ``ETHTOOL_A_CABLE_TEST_HEADER``       nested  request header
>    ====================================  ======  ==========================
>  
> +Notify 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,
> +depends on the specific hardware. Hence the contents of the notify

   depending on

> +message is mostly optional. The attributes can be repeated an

           are

> +arbitrary number of times, in an arbitrary order, for an arbitrary
> +number of pairs.
> +
> +The example shows a T2 cable, i.e. two pairs. One pair is O.K, and

                                                             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_NTF_RESULT``       | nested | cable test result     |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_RESULTS_PAIR``        | u8     | pair number           |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_RESULTS_CODE``        | u8     | result code           |
> + +-+-----------------------------------------+--------+-----------------------+
> + | ``ETHTOOL_A_CABLE_TEST_NTF_RESULT``       | nested | cable test results    |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_RESULTS_PAIR``        | u8     | pair number           |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_RESULTS_CODE``        | u8     | result code           |
> + +-+-----------------------------------------+--------+-----------------------+
> + | ``ETHTOOL_A_CABLE_TEST_NTF_FAULT_LENGTH`` | nested | cable length          |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_FAULT_LENGTH_PAIR``   | u8     | pair number           |
> + +-+-----------------------------------------+--------+-----------------------+
> + | | ``ETHTOOL_A_CABLE_FAULT_LENGTH_CM``     | u8     | length in cm          |
> + +-+-----------------------------------------+--------+-----------------------+
>  
>  Request translation
>  ===================



-- 
~Randy