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be2net: enable IOMMU pass through for be2net
This patch sets the coherent DMA mask to 64-bit after the be2net driver has been acknowledged that the system is 64-bit DMA capable. The coherent DMA mask is examined by the Intel IOMMU driver to determine whether to allow pass through context mapping for all devices. With this patch, the be2net driver combined with be2net compatible hardware provides comparable performance to the case where vt-d is disabled. The main use-case for this change is to decrease the time necessary to copy virtual machine memory during KVM live migration instantiations. This patch was tested on a system that enables the IOMMU in non-coherent mode. Two DMA remapper issues were encountered in the previous version and both patches have been committed. commit ea2447f commit 2e12bc2 Signed-off-by: Craig Hada <email@example.com> Signed-off-by: Sathya Perla <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com>
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