Re: a question about DMA (realtek ethernet chip driver)

Chan Kim <ckim@etri.re.kr> : [...]

Is the data in sk_buf copied to the DMA ring somewhere? if it is, where in the code is it done?

See dma_map_* functions, Documentation/DMA-API*, lib/swiotlb.c and drivers/iommu/iommu.c -- Ueimor