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Vladimir Oltean says: ==================== Introduce the dsa_xmit_port_mask() tagging protocol helper What ---- Some DSA tags have just the port number in the TX header format, others have a bit field where in theory, multiple bits can be set, even though DSA only sets one. The latter kind is now making use of a dsa_xmit_port_mask() helper, which will decide when to set more than 1 bit in that mask. Why --- David Yang has pointed out in a recently posted patch that HSR packet duplication on transmission can be offloaded even on HSR-unaware switches. This should be made generally available to all DSA switches. How to test ----------- These patches just lay the groundwork, and there should be no functional change - so for this set, regression testing is all that's necessary. For testing the HSR packet duplication idea, I've put together a branch: https://github.com/vladimiroltean/linux/commits/dsa-simple-hsr-offload/ where most drivers are patched to call dsa_port_simple_hsr_join() and dsa_port_simple_hsr_leave(). Assuming there are volunteers to also test the latter, one can enable CONFIG_HSR and create a HSR device using: $ ip link add name hsr0 type hsr slave1 swp0 slave2 swp1 supervision 45 version 1 This needs to be connected using 2 cables to another system where the same command was run. Then, one should be able to ping the other board through the hsr0 interface. Without the Github branch, a ping over HSR should increase the DSA conduit interface's TX counters by 2 packets. With the Github branch, the TX counters should increase by only 1 packet. Why so many patches ------------------- To avoid the situation where a patch has to be backported, conflicts with the work done here, pulls this in as a dependency, and that pulls in 13 other unrelated drivers. These don't have any dependencies between each other and can be cherry-picked at will (except they all depend on patch 1/15). ==================== Link: https://patch.msgid.link/20251127120902.292555-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.