How do DMA Direct Memory Access memory mappings work?

Solution Verified - Updated -

Issue

  • How do DMA Direct Memory Access memory mappings work?
  • We would like to enable/disable DMA on devices
  • How can we come to know DMA is getting used by NIC?

Environment

  • Red Hat Enterprise Linux 6
  • Hardware devices on PCI PCI-X PCIe bus using DMA (Direct Memory Access)

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