The axiethernet driver now uses the dmaengine framework to communicate with the xilinx DMAengine driver(AXIDMA, MCDMA). The inspiration behind this dmaengine adoption is to reuse the in-kernel xilinx dma engine driver[1] and remove redundant dma programming sequence[2] from the ethernet driver. This simplifies the ethernet driver and also makes it generic to be hooked to any complaint dma IP i.e AXIDMA, MCDMA without any modification. This initial version is a proof of concept and validated with a ping test on an AXI ethernet subsystem 1G + xilinx AXI DMA design. There is an anticipated performance impact due to the adoption of the dmaengine framework. The plan is to revisit it once all required functional features are implemented. The dmaengine framework was extended for metadata API support during the axidma RFC[3] discussion. However, it still needs further enhancements to make it well suited for ethernet usecases. The ethernet features i.e ethtool set/get of DMA IP properties, ndo_poll_controller, trigger reset of DMA IP from ethernet are not supported (mentioned in TODO) and it requires follow-up discussion and dma framework enhancement. Comments, suggestions, thoughts to implement remaining functional features are very welcome! [1]: https://github.com/torvalds/linux/blob/master/drivers/dma/xilinx/xilinx_dma.c [2]: https://github.com/torvalds/linux/blob/master/drivers/net/ethernet/xilinx/xilinx_axienet_main.c#L238 [3]: http://lkml.iu.edu/hypermail/linux/kernel/1804.0/00367.html This series is based on dmaengine tree commit: #a38fd8748464 Radhey Shyam Pandey (3): dt-bindings: net: xilinx_axienet: convert bindings document to yaml dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support net: axienet: Introduce dmaengine support .../devicetree/bindings/net/xilinx_axienet.txt | 80 -- .../devicetree/bindings/net/xilinx_axienet.yaml | 155 +++ MAINTAINERS | 1 + drivers/net/ethernet/xilinx/xilinx_axienet.h | 141 +-- drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 1050 ++++---------------- 5 files changed, 341 insertions(+), 1086 deletions(-) delete mode 100644 Documentation/devicetree/bindings/net/xilinx_axienet.txt create mode 100644 Documentation/devicetree/bindings/net/xilinx_axienet.yaml -- 2.7.4
