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The field dev_port of struct net_device indicates the port number of a network device [1]. This patch populates this field. This field can be helpful to distinguish between the two network interfaces of a dual channel device (i.e. ES581.4 or ES582.1). Indeed, at the moment, all the network interfaces of a same device share the same static udev attributes c.f. output of: | udevadm info --attribute-walk /sys/class/net/canX The dev_port attribute can then be used to write some udev rules to, for example, assign a permanent name to each network interface based on the serial/dev_port pair (which is convenient when you have a test bench with several CAN devices connected simultaneously and wish to keep consistent interface names upon reboot). [1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net Link: https://lore.kernel.org/all/20211026180553.1953189-1-mailhol.vincent@wanadoo.fr Suggested-by: Lukas Magel <lukas.magel@escrypt.com> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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.