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Now that the driver registers a PTP clock device that represents the clock hardware, it is important that the clock index is reported via the ethtool .get_ts_info callback. The underlying hardware resource is shared between multiple PF functions. Only one function owns the hardware resources associated with a timer, but multiple functions may be associated with it for the purposes of timestamping. To support this, the owning PF will store the clock index into the driver shared parameters buffer in firmware. Other PFs will look up the clock index by reading the driver shared parameter on demand when requested via the .get_ts_info ethtool function. In this way, all functions which are tied to the same timer are able to report the clock index. Userspace software such as ptp4l performs a look up on the netdev to determine the associated clock, and all commands to control or configure the clock will be handled through the controlling PF. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Tony Brelinski <tonyx.brelinski@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> |
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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.