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Accelerate TX packet duplication with HSR rings. This is only possible with the NPI-based "ocelot" tagging protocol, not with "ocelot-8021q", because the latter does not use dsa_xmit_port_mask(). This has 2 implications: - Depending on tagging protocol, we should set (or not set) the offload feature flags. Switching tagging protocols is done with ports down, by design. Additional calls to dsa_port_simple_hsr_join() can be put in the ds->ops->change_tag_protocol() path, as I had originally tried, but this would not work: dsa_user_setup_tagger() would later clear the feature flag that we just set. So the additional call to dsa_port_simple_hsr_join() should sit in the ds->ops->port_enable() call. - When joining a HSR ring and we are currently using "ocelot-8021q", there are cases when we should return -EOPNOTSUPP (pessimistic) and cases when we shouldn't (optimistic). In the pessimistic case, it is a configuration that the port won't support even with the right tagging protocol. Distinguishing between these 2 cases matters because if we just return -EOPNOTSUPP regardless, we lose the dp->hsr_dev pointer and can no longer replay the offload later for the optimistic case, from felix_port_enable(). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://patch.msgid.link/20251130131657.65080-8-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.