mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-30 14:33:24 -04:00
987137345f
In addition to SGMII, the RTL8367S SerDes also supports HSGMII, which carries 2.5 Gbps with the same signaling as SGMII at 2.5x clock rate. The chip info table already declares HSGMII as a supported interface mode for external interface 1. Extend the SerDes PCS to handle HSGMII, which phylink represents as 2500base-x: - Select the HSGMII SerDes tuning parameters and external interface mode, and mux the SerDes to MAC8 in HSGMII mode, from pcs_config() according to the interface. The parameters are again lifted from the GPL-licensed Realtek rtl8367c vendor driver, and again only cover the tuning variant for a non-zero chip option, so the mode is gated on the option probed at setup. - Advertise 2500base-x and MAC_2500FD on ports whose external interface supports HSGMII. - Accept SPEED_2500 in the forced link configuration. The MAC speed field has no 2.5 Gbps value: the rate is determined by the HSGMII SerDes configuration, and the vendor driver programs the 1 Gbps value here, so do the same. - Raise the port 6 ingress and egress rate limiters to their maximum at setup time, as the vendor switch init does unconditionally for the whole chip family. The chip resets them to 0x1FFFF (~1.048 Gbps in units of 8 Kbps), which caps the aggregate HSGMII throughput at roughly 1 Gbps. The vendor documentation describes the reset default as disabling the limiter, but the cap is real: on an RTL8367S-based Mercusys MR85X running an OpenWrt backport of this series, several clients on 1 Gbps user ports were limited to about 1.02 Gbps combined across the HSGMII CPU port until these limiters were raised, after which throughput reached about 2 Gbps [1]. The related HSGMII scheduler line rate (LINE_RATE_HSG_H) is already set to its maximum by the common init jam table. Tested on a Mercusys MR80X v2.20, where the RTL8367S is connected to the SoC over HSGMII. Link: https://github.com/openwrt/openwrt/pull/19445#issuecomment-4505613294 [1] Suggested-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Suggested-by: Mieczyslaw Nalewaj <namiltd@yahoo.com> Signed-off-by: Johan Alvarado <contact@c127.dev> Tested-by: Stanisław Pal <kuncy7@gmail.com> Reviewed-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Reviewed-by: Mieczyslaw Nalewaj <namiltd@yahoo.com> Tested-by: Stanislaw Pal <kuncy7@gmail.com> Link: https://patch.msgid.link/20260711-rtl8367s-sgmii-v6-2-88f7944ddca7@c127.dev Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst