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Oleksij Rempel says: ==================== provide KAPI for SQI This patches are extending ethtool netlink interface to export Signal Quality Index (SQI). SQI provided by 100Base-T1 PHYs and can be used for cable diagnostic. Compared to a typical cable tests, this value can be only used after link is established. changes v3: - rename __ethtool_get_sqi* to linkstate_get_sqi*. And move this functions to the net/ethtool/linkstate.c - protect linkstate_get_sqi* with locking changes v2: - use u32 instead of u8 for SQI - add SQI_MAX field and callbacks - some style fixes in the rst. - do not convert index to shifted index. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.