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Hi 0xDEAN, please check the following links:
- Intel® Server Adapters — Where to Get the IOATDMA Driver for Linux*
- Intel I/O Acceleration Technology: Intel Network Adapters User Guide
- Linux/drivers/dma/ioat/dma.c - Linux Cross Reference - Free Electrons
I've found out through other channels that ioatdma v3.2 doesn't support reading from PCIe/MMIO.
Apparently v3.3 does. I haven't been able to confirm this in any publicly available documentation.