2024-11-06 15:50 (UTC+0000), Wieckowski, Jacob: > Is DMA access to the bar memory of a PCIe device with DPDK possible? > If so, which example project could be used as a reference to gain a better > understanding of this topic?
Hi, BAR (base address register) is a place in PCI configuration space, so one really doesn't "DMA transfers to PCIe BAR memory" to be precise. Read https://wiki.osdev.org/PCI_Express to explore the topic. DPDK drivers write to BARs to configure devices, specifically to setup memory-mapped IO which is used for DMA. Take a look at this project, which is a toy version of DPDK, and thus it is easier to grasp: https://github.com/ixy-languages/ixy-languages
