Jan Leon a34ff932fa qualcommax: qca_ppe: fix BPDU trapping and CPU transmission
The STP APP_CTRL rule uses 0x93fc for its third word. CMD occupies
bits 16:15 of that word, so this selects DROP (1), not the intended
REDIRECT_TO_CPU (3). Incoming BPDUs never reach the bridge protocol
implementation even though ordinary traffic continues to work.

Correcting only CMD exposes another issue: the 0x7f ingress port mask
includes CPU port 0. CPU-originated BPDUs are then trapped back to the
CPU rather than transmitted to the selected external port. Exclude
the CPU and SoC-specific loopback ports, deriving the remaining mask
from the port count. Use named fields for the third word so the action
and port selection are explicit.

On an AX3600/IPQ8074 running 6.18.44, register readback confirmed the
original rule. A guarded runtime test of 0x193fc restored BPDU reception
but captured locally generated BPDUs on the CPU RX path. With 0x193f4,
those RX reflections disappeared and the adjacent switch received
bridge protocol traffic again. Reapplying that value automatically
after a reboot established RSTP with the upstream root. The patched
driver also builds against the matching aarch64 kernel SDK.

IPQ6018's generated mask was checked, but not tested on hardware.

Fixes: 142104bb90 ("qualcommax: add PPE driver")
Assisted-by: OpenAI Codex
Signed-off-by: Jan Leon <Jan.gaschler@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/25063
Signed-off-by: Robert Marko <robimarko@gmail.com>
2026-09-07 15:59:08 +02:00

OpenWrt logo

OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

Sunshine!

Download

Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.

If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.

An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:

Development

To build your own firmware you need a GNU/Linux, BSD or macOS system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.8+ rsync subversion unzip which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

  • LuCI Web Interface: Modern and modular interface to control the device via a web browser.

  • OpenWrt Packages: Community repository of ported packages.

  • OpenWrt Routing: Packages specifically focused on (mesh) routing.

  • OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

Support Community

  • Forum: For usage, projects, discussions and hardware advise.
  • Support Chat: Channel #openwrt on oftc.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0

S
Description
No description provided
Readme
277 MiB
Languages
C 60.8%
Makefile 23.2%
Shell 8.1%
Perl 2.6%
UnrealScript 2.2%
Other 2.9%