Felipe De Bene felipedbene

ENA CREATE_CQ on Haiku/arm64: what it was, and what was ruled out

Status: resolved, 2026-08-20. CREATE_CQ is accepted, both queue pairs create, the link comes up, DHCP works, and Haiku accepts an SSH login over its own ENA driver on a native EC2 instance. The resolution is the next section; the rest of this document is the investigation, kept in chronological order because the shape of the search is the useful part.

The bug was: ena_com_create_io_cq() failing with ENA_ADMIN_UNKNOWN_ERROR (6) and extended_status = 0, with nothing else failing.

	#!/bin/bash

	# Specify the desired volume size in GiB as a command line argument. If not specified, default to 20 GiB.
	SIZE=${1:-20}

	# Get the ID of the environment host Amazon EC2 instance.
	INSTANCEID=$(curl http://169.254.169.254/latest/meta-data/instance-id)

	# Get the ID of the Amazon EBS volume associated with the instance.
	VOLUMEID=$(aws ec2 describe-instances \