Guides host-side loading of custom congestion control algorithms onto BlueField DPUs via DOCA PCC.
npx skills add https://github.com/NVIDIA/skills --skill doca-pcc
Please help me install this Agent Skill. Skill: doca-pcc Source: https://github.com/NVIDIA/skills/tree/main/skills/doca-pcc Command: npx skills add https://github.com/NVIDIA/skills --skill doca-pcc
Deploying a custom Programmable Congestion Control algorithm onto a BlueField DPU involves a two-side-program model (host-side doca-pcc plus a dpacc-compiled DPA-side algorithm), triple-axis capability preconditions, and a confusing DOCA_ERROR_* surface; this Skill walks an agent through that entire workflow correctly.
Ask your agent to load a custom congestion control algorithm onto the BlueField port carrying your RoCE traffic using the doca-pcc library.
High-intent search queries and answers about installing and using this skill.
Create a doca_pcc context against the doca_dev for the target port, load the dpacc-compiled doca_pcc_app image, set the algorithm's host-side parameters, and call doca_pcc_start. The Skill walks configure, build, run, test, and debug steps in order.
doca-pcc is a host-side library for loading custom congestion control algorithms, while pcc_counters is a read-only diagnostic CLI for inspecting PCC counters at a port. They share a name prefix but are separate artifacts; the Skill routes counter questions to the DOCA tools documentation.
The most common cause is the BlueField firmware not having the custom-PCC slot enabled, which looks identical to a device-access permission problem at the API surface. The fix is a firmware-side enable plus a BlueField reset, not a host-OS permission change.
No. Custom PCC requires a BlueField generation that exposes a DPA processor to the host, firmware with the custom-PCC slot enabled, and a DOCA install whose doca_pcc_cap_* queries confirm support. Older BlueField generations without DPA hardware fail capability queries regardless of DOCA version.
No. The doca-pcc library loads an algorithm the user supplies; it does not define one. Algorithm design is a domain and research question routed to the public DOCA PCC programming guide and the user's own congestion-control expertise.
The most common causes are no RDMA/RoCE traffic on the attached port, doca_pcc_start never being called, or the host not progressing the progress engine so reports never arrive. Verify traffic exists on the port and inspect port counters with the pcc_counters tool.
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