map_vf_dma_caddr and map_vf_dma_baddr are two functions used in the Virtual Function (VF) driver for DMA mapping.
map_vf_dma_caddr: This function maps a virtual address to a physical address that can be used for DMA transfers. The “c” in caddr stands for consistent, which means that the mapping is guaranteed to be valid throughout the lifetime of the mapped memory region. This function is typically used for mapping buffers that are allocated by the VF driver.
map_vf_dma_baddr: This function maps a virtual address to a physical address that can be used for DMA transfers, but it does not guarantee consistency. The “b” in baddr stands for burstable, which means that the mapping may become invalid or change during the lifetime of the mapped memory region. This function is typically used for mapping buffers that are allocated by the OS kernel or another device driver.
In summary, map_vf_dma_caddr provides a consistent mapping while map_vf_dma_baddr provides a burstable mapping. The choice between these functions depends on the type of buffer being mapped and how it is allocated.
