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This is another stab at commit1461d212ab("net/sched: taprio: make qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"), later reverted in commitaf7b29b1de("Revert "net/sched: taprio: make qdisc_leaf() see the per-netdev-queue pfifo child qdiscs""). I believe that the problems that caused the revert were fixed, and thus, this change is identical to the original patch. Its purpose is to properly reject attaching a software taprio child qdisc to a software taprio parent. Because unoffloaded taprio currently reports itself (the root Qdisc) as the return value from qdisc_leaf(), then the process of attaching another taprio as child to a Qdisc class of the root will just result in a Qdisc_ops :: change() call for the root. Whereas that's not we want. We want Qdisc_ops :: init() to be called for the taprio child, in order to give the taprio child a chance to check whether its sch->parent is TC_H_ROOT or not (and reject this configuration). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20230807193324.4128292-4-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 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.