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The PPE (packet process engine) hardware block is available in Qualcomm IPQ chipsets that support PPE architecture, such as IPQ9574. The PPE in the IPQ9574 SoC includes six Ethernet ports (6 GMAC and 6 XGMAC), which are used to connect with external PHY devices by PCS. It includes an L2 switch function for bridging packets among the 6 Ethernet ports and the CPU port. The CPU port enables packet transfer between the Ethernet ports and the ARM cores in the SoC, using the Ethernet DMA. The PPE also includes packet processing offload capabilities for various networking functions such as route and bridge flows, VLANs, different tunnel protocols and VPN. The PPE switch is modeled according to the Ethernet switch schema, with additional properties defined for the switch node for interrupts, clocks, resets, interconnects and Ethernet DMA. The switch port node is extended with additional properties for clocks and resets. Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Luo Jie <quic_luoj@quicinc.com> Link: https://patch.msgid.link/20250818-qcom_ipq_ppe-v8-1-1d4ff641fce9@quicinc.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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.