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Luo Jie says: ==================== Add PPE driver for Qualcomm IPQ9574 SoC The PPE (packet process engine) hardware block is available in Qualcomm IPQ chipsets that support PPE architecture, such as IPQ9574 and IPQ5332. 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. The PPE also includes packet processing offload capabilities for various networking functions such as route and bridge flows, VLANs, different tunnel protocols and VPN. It also 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. This patch series is the first part of a three part series that will together enable Ethernet function for IPQ9574 SoC. While support is initially being added for IPQ9574 SoC, the driver will be easily extendable to enable Ethernet support for other IPQ SoC such as IPQ5332. The driver can also be extended later for adding support for L2/L3 network offload features that the PPE can support. The functionality to be enabled by each of the three series (to be posted sequentially) is as below: Part 1: The PPE patch series (this series), which enables the platform driver, probe and initialization/configuration of different PPE hardware blocks. Part 2: The PPE MAC patch series, which enables the phylink operations for the PPE Ethernet ports. Part 3: The PPE EDMA patch series, which enables the Rx/Tx Ethernet DMA and netdevice driver for the 6 PPE Ethernet ports. A more detailed description of the functions enabled by part 1 is below: 1. Initialize PPE device hardware functions such as buffer management, queue management, scheduler and clocks in order to bring up PPE device. 2. Enable platform driver and probe functions 3. Register debugfs file to provide access to various PPE packet counters. These statistics are recorded by the various hardware process counters, such as port RX/TX, CPU code and hardware queue counters. 4. A detailed introduction of PPE along with the PPE hardware diagram in the first two patches (dt-bindings and documentation). Below is a reference to an earlier RFC discussion with the community about enabling Ethernet driver support for Qualcomm IPQ9574 SoC. This writeup can help provide a higher level architectural view of various other drivers that support the PPE such as clock and PCS drivers. Topic: RFC: Advice on adding support for Qualcomm IPQ9574 SoC Ethernet. https://lore.kernel.org/linux-arm-msm/d2929bd2-bc9e-4733-a89f-2a187e8bf917@quicinc.com/ Signed-off-by: Luo Jie <quic_luoj@quicinc.com> ==================== Link: https://patch.msgid.link/20250818-qcom_ipq_ppe-v8-0-1d4ff641fce9@quicinc.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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| README | ||
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.