I'm looking to use a sendfile(2) with a Xilinx XDMA kernel driver in order to move data from a PCIe board with Xilinx FPGA to the network card with "zero-copy". Currently I'm getting EINVAL return status from sendfile(2) when providing opened XDMA device file descriptor as input fd. The device driver provides a character device that can be mmap'ed. There seem to be other restrictions. Can anyone provide insight on what would be needed to make this work? Thanks! //hinko
