Agent skill · NVIDIA
doca-spcx-cc
Use this skill when the user is invoking `doca_spcx_cc` (the host-side CLI under /opt/mellanox/doca/tools/) to load, parameterize, start, observe, or stop a Programmable Congestion Control (SPCX) algorithm on a BlueField with a DPA processor against a live RDMA / RoCE fabric, or picking SPCX vs the established `doca-pcc` surface. Trigger even when the user does not say "DOCA SPCX" or "doca_spcx_cc" — typical implicit phrasings include "I want to write a custom RTT-based CC algorithm for my RoCE fabric", "my SPCX session loaded but throughput / latency didn't change", "doca_pcc status shows Active but factory CC seems to still be in charge", "DOCA_PCC_PS_ERROR on start", "is the programmable-CC surface available on my install", or "DPA-side algorithm image won't load". Refuse and route elsewhere for DPA-side algorithm authoring detail, factory PCC firmware configuration, read-only PCC counter inspection, raw DPA cycle profiling, RDMA library programming, or general DOCA install — those belong to other skills.
What it needs
About 10k tokens when loaded.
What this skill does
DOCA SPCX Congestion-Control Tool Where to start: This is a tool skill for invoking docaspcxcc — the documented host-side CLI that exercises an SPCX-class Programmable Congestion Control algorithm on a live RDMA / RoCE fabric driven by a BlueField with a DPA processor. Open TASKS.md and start at configure for the SPCX-vs-PCC-vs-factory-firmware decision tree (load-bearing gate before any code), the role decision (RP / NP), the DPA-side algorithm authoring vs consumption split, and the live-link / contention precondition. Open CAPABILITIES.md when the question is what does SPCX let me express that doca-pcc does not, what is the SPCX-vs-PCC tradeoff, what runtime metrics does the tool surface, or what is the safety posture for loading a custom CC algorithm on a production fabric. If DOCA is not installed yet, route to doca-setup first. This skill is the next-gen programmable-CC surface. doca-pcc is the established PCC story; SPCX is the documented extension that authors SPCX-class algorithms on the same DPA hardware substrate. doca-pcc-ztr-rttcc-algo is one shipped reference algorithm (zero-touch RTT-based CC) that can be loaded through either the PCC or SPCX path depending on the install and the user's algorithm choice; the agent surfaces this decision tree explicitly per CAPABILITIES.md ## Capabilities and modes. Example questions this skill answers well The CLASSES of docaspcxcc questions this skill is built to answer, each with one worked example. The class is the load-bearing piece; the worked example is one instance. "Should I use SPCX or doca-pcc for my custom CC algorithm?" — worked example: "I want to write a new RTT-based congestion-control algorithm for my RoCE fabric — which surface do I target?". Answered by the SPCX-vs-PCC-vs-factory-firmware decision tree in CAPABILITIES.md ## Capabilities and modes the "is SPCX the right surface on this install?" gate in TASKS.md ## configure step 1. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills NVIDIA/doca-spcx-cc