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During the development of CAN XL, we found the need of creating a dummy CAN XL driver in order to test the new netlink interface. While this code was initially intended to be some throwaway, it received some positive feedback. Add the dummy_can driver. This driver acts similarly to the vcan interface in the sense that it will echo back any packet it receives. The difference is that it exposes a set on bittiming parameters as a real device would and thus must be configured as if it was a real physical interface. The driver comes with a debug mode. If debug message are enabled (for example by enabling CONFIG_CAN_DEBUG_DEVICES), it will print in the kernel log all the bittiming values, similar to what a: ip --details link show can0 would do. This driver is mostly intended for debugging and testing, but some developers also may want to look at it as a simple reference implementation. Signed-off-by: Vincent Mailhol <mailhol@kernel.org> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://patch.msgid.link/20251126-canxl-v8-15-e7e3eb74f889@pengutronix.de 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 reStructuredText 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.