facebook/fboss
Sep 2025 – Mar 2026
4 Months active
Languages Used
C++CSVJSON
Technical Skills
C++ developmentEmbedded systemsPlatform configurationembedded systemsnetworkingnetwork programming
Lihua Chen
PROFILE
Lihua Chen
Lihua Chen contributed to the facebook/fboss repository by developing and integrating platform support for the Santa Barbara (tahansb800bc) hardware, focusing on scalable configuration and high-speed networking features. Using C++ and leveraging embedded systems expertise, Lihua implemented end-to-end platform mapping, automated configuration generation with CSV and JSON, and enabled 200G/400G backplane port profiles. The work included management port support, aligning configuration artifacts and system architecture for improved observability and out-of-band management. Lihua also addressed a critical bug affecting 400G FEC counter visibility, enhancing operational reliability. The contributions demonstrated depth in system programming and robust validation through comprehensive testing.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
4Total
Bugs
1
Commits
4
Features
3
Lines of code
130,113
Activity Months4
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Work History
March 2026
1 Commits
Mar 1, 2026March 2026 monthly summary focusing on delivering a critical reliability improvement for 400G port observability in fboss. Root cause analysis identified a missing FEC profile ID in SaiPortUtils.cpp getFecModeFromSaiFecMode(), which caused FEC counters to be unavailable in fboss2 interface commands. The fix added the necessary profile IDs (including Ladakh800bcls, Tahansb800bc, and the PROFILE_800G_4_PAM4_RS544X2N_COPPER) and validated that FEC counters now display correctly in fboss2 show interface phy and fboss2 show interface counters fec line ber. The change was merged as part of PR 1015 (commit bc781b3796cb4de6db188ff54ce616dd483d072a) after passing pre-commit checks and linting.
1 Commits
Mar 1, 2026March 2026 monthly summary focusing on delivering a critical reliability improvement for 400G port observability in fboss. Root cause analysis identified a missing FEC profile ID in SaiPortUtils.cpp getFecModeFromSaiFecMode(), which caused FEC counters to be unavailable in fboss2 interface commands. The fix added the necessary profile IDs (including Ladakh800bcls, Tahansb800bc, and the PROFILE_800G_4_PAM4_RS544X2N_COPPER) and validated that FEC counters now display correctly in fboss2 show interface phy and fboss2 show interface counters fec line ber. The change was merged as part of PR 1015 (commit bc781b3796cb4de6db188ff54ce616dd483d072a) after passing pre-commit checks and linting.
March 2026
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for facebook/fboss: Delivered end-to-end Management Port (mgmt port) support on the FBOSS platform, enabling the management interface (eth1/9/1) to be Up and reachable, improving out-of-band management and fleet observability. This month focused on implementing mgmt port features, aligning config/data artifacts, and validating through wedge_agent bring-up tests.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for facebook/fboss: Delivered end-to-end Management Port (mgmt port) support on the FBOSS platform, enabling the management interface (eth1/9/1) to be Up and reachable, improving out-of-band management and fleet observability. This month focused on implementing mgmt port features, aligning config/data artifacts, and validating through wedge_agent bring-up tests.
October 2025
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — FBOSS development focused on enabling high-density 200G/400G backplane capabilities for the tahansb800bc platform and tightening platform mapping reliability. Delivered a new 200G/400G backplane port profile feature, fixed mapping/config gaps, and validated end-to-end through extensive tests and live interface checks. Key PRs and commits: - Tahansb800bc Platform: Add 200G/400G Backplane Port Profiles (commit e1fd438... in #586) with updates to port_profile_mapping.csv, si_settings.csv, and static_mapping.csv (core IDs 58/59) to enable 8 lanes per core and correct mappings. - End-to-end validation included generation of tahansb800bc_platform_mapping.json and passing sanity tests (sai_agent_test, link_test, ping tests, etc.). PR resolution: D84514197; pulled by: birdsoup. - Demonstrated platform readiness through user-visible checks: interface snapshots show 400G ports (eth1/1/1,3,5,7) with 2001 VLANs and IPv4/IPv6 addresses; successful IPv4 ping to 10.0.0.2; IPv6 pings show high reliability with intermittent packet loss indicating ongoing IPv6 profiling but overall connectivity verified. - Extensive test suite coverage for warm/cold boot paths and QoS/ACL/queue mappings, with tests like AgentPortBandwidthPpsTest, HwAclLookupClassQualifierTest, and Olympic QOS tests passing. - Work consolidated under facebook/fboss repository, enabling the tahansb800bc platform to scale to 200G/400G speeds and providing a stronger foundation for future feature work.
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — FBOSS development focused on enabling high-density 200G/400G backplane capabilities for the tahansb800bc platform and tightening platform mapping reliability. Delivered a new 200G/400G backplane port profile feature, fixed mapping/config gaps, and validated end-to-end through extensive tests and live interface checks. Key PRs and commits: - Tahansb800bc Platform: Add 200G/400G Backplane Port Profiles (commit e1fd438... in #586) with updates to port_profile_mapping.csv, si_settings.csv, and static_mapping.csv (core IDs 58/59) to enable 8 lanes per core and correct mappings. - End-to-end validation included generation of tahansb800bc_platform_mapping.json and passing sanity tests (sai_agent_test, link_test, ping tests, etc.). PR resolution: D84514197; pulled by: birdsoup. - Demonstrated platform readiness through user-visible checks: interface snapshots show 400G ports (eth1/1/1,3,5,7) with 2001 VLANs and IPv4/IPv6 addresses; successful IPv4 ping to 10.0.0.2; IPv6 pings show high reliability with intermittent packet loss indicating ongoing IPv6 profiling but overall connectivity verified. - Extensive test suite coverage for warm/cold boot paths and QoS/ACL/queue mappings, with tests like AgentPortBandwidthPpsTest, HwAclLookupClassQualifierTest, and Olympic QOS tests passing. - Work consolidated under facebook/fboss repository, enabling the tahansb800bc platform to scale to 200G/400G speeds and providing a stronger foundation for future feature work.
October 2025
September 2025
1 Commits • 1 Features
Sep 1, 2025In September 2025, delivered foundational Santa Barbara platform support for Tahansb800bc in fboss, establishing the groundwork for scalable platform onboarding and configuration generation. Implemented platform mapping support end-to-end, including CSV mappings, agent CPP scaffolding, and JSON generation, enabling automated configuration and better hardware abstraction. Created and wired platform port and mapping code (SaiBcmTahansb800bc) with accompanying CMake updates to streamline builds across the fboss agent and platform layers. Validated core SAI binaries and performed targeted sanity tests to ensure stability of the new platform integration. Note: mgmt port configuration remains blocked by a SAI-related issue and will be tackled in a follow-up PR. Overall, this work accelerates support for Santa Barbara hardware, reduces configuration complexity for operators, and lays the foundation for future automation and platform-specific features.
September 2025
1 Commits • 1 Features
Sep 1, 2025In September 2025, delivered foundational Santa Barbara platform support for Tahansb800bc in fboss, establishing the groundwork for scalable platform onboarding and configuration generation. Implemented platform mapping support end-to-end, including CSV mappings, agent CPP scaffolding, and JSON generation, enabling automated configuration and better hardware abstraction. Created and wired platform port and mapping code (SaiBcmTahansb800bc) with accompanying CMake updates to streamline builds across the fboss agent and platform layers. Validated core SAI binaries and performed targeted sanity tests to ensure stability of the new platform integration. Note: mgmt port configuration remains blocked by a SAI-related issue and will be tackled in a follow-up PR. Overall, this work accelerates support for Santa Barbara hardware, reduces configuration complexity for operators, and lays the foundation for future automation and platform-specific features.
Activity
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Quality Metrics
Correctness95.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage25.0%
Skills & Technologies
Programming Languages
C++CSVJSON
Technical Skills
C++ developmentEmbedded systemsPlatform configurationembedded systemsnetwork programmingnetworkingsystem architecturesystem programming
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