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In case the interface was set up but cannot establish the link, ethtool will print more information to help the user troubleshoot the state. For example, no link due to missing cable: $ ethtool eth1 ... Link detected: no (No cable) Beside the general extended state, drivers can pass additional information about the link state using the sub-state field. For example: $ ethtool eth1 ... Link detected: no (Autoneg, No partner detected) The extended state is available only for specific cases, in other cases ethtool with print only "Link detected: no" as before Signed-off-by: Moshe Tal <moshet@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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.