On 7/2/2012 2:44 PM, Klaus Wacker wrote:
[...] So whats the nature of the returned DMA address of ib_dma_map_single and can we assume that it is the same value on different devices on one system?
Currently, over all IB drivers/devices except for ipath and qib, ib_dma_map_single is just plain dma_map_single, so your questions relates directly to the Linux DMA mapping API (and BTW - the answer is YES, in the general case you must use a DMA address you were provided when calling dma_map_single with device being X only for transactions carried over X). For those devices that hack ib_dma_map_single, it might be possible to use address provided from device X over device Y, but this is a hack, and I would strongly recommend not to have it in you code.
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